Piet Oudolf: Meadow Maker – Part Two

Following on part one, this is the second part of my exploration of the Piet Oudolf-designed entry border at the Toronto Botanical Garden.

Planting Plan-Piet Oudolf-Hardscape-Martin Wade-Toronto Botanical Garden

The plant design of the entry walk garden at Toronto Botanical Garden is much more exacting than the drifts and blocks in a conventional border. If you think of a broad meadow like this as a painting, the effect of each series of neighbouring brush strokes is known in advance.  For these plants are like children to Piet Oudolf, many grown and observed for decades in his own Dutch garden, many even bred by him or fellow nurserymen in the Netherlands and Germany.

Piet Oudolf Entry Garden-Toronto Botanical Garden

Designed Combinations

Let’s skip around Piet’s original planting design and have a look at twelve of the combinations he planned, as they manifested themselves over the past decade.  It’s important to note that all these plants fulfill Piet’s mandate that plants must be: relatively adaptable to soil, i.e. neither too wet nor too dry; vigorous enough to grow without fertilizers or pesticides; strong enough to stand without staking (as with the lovely single peonies in Part One, in contrast to floppy double peonies). Plants should be resilient and long-lived. His plant combinations are not dictated by colour, but by form; however, you’ll see some lovely colour pairings in the examples below.

1.Willowleaf bluestar (Amsonia tabernaemontana var. salicifolia) and ‘Purple Smoke’ false indigo (Baptisia australis).

Design-Amsonia & Baptisia-Piet Oudolf design-Toronto Botanical Garden

This is one of the most stable and effective pairings in the entry garden.

Design-Amsonia tabernaemontana var. salicifolia & Baptisia 'Purple Smoke'-Piet Oudolf border-Toronto Botanical Garden

Year after year, these two North American natives (technically, the baptisia selection is called a “nativar”, i.e.  native cultivar) emerge and come into flower at exactly the same time.  They seem to be on the very same wavelength, and equally lovely. And the amsonia, of course, takes on golden-yellow hues in autumn.

Design-Amsonia tabernaemontana var. salicifolia & Baptisia 'Purple Smoke'2-Piet Oudolf border-Toronto Botanical Garden

2. ‘Roma’ masterwort (Astrantia major) and ‘Rose Clair’ geranium (G. x oxonianum).

Astrantia 'Roma' & Geranium x oxonianum 'Rose Clair'-Piet Oudolf design-Toronto Botanical Garden

These two late-spring perennials share a pleasing rosy hue and a soft presence.

Design-Astrantia 'Roma' & Geranium x oxonianum 'Rose Clair'-Piet Oudolf border-Toronto Botanical Garden

3.‘Claret’ masterwort (Astrantia major) & ‘Mainacht’ =’May Night’ meadow sage (Salvia nemorosa).

Design-Astrantia major 'Claret' & Salvia nemorosa 'Mainacht'-Piet Oudolf design-Toronto Botanical Garden

Dark-red ‘Claret’ astrantia is another Piet Oudolf breeding selection, a seedling (like his ‘Roma’ above), of ‘Ruby Wedding’. It looks lovely here in a romantic June combination with indigo-blue ‘Mainacht’ sage. To the left is ornamental clover (Trifolium rubens), to the right is drumstick allium (A. sphaerocephalon).

Design-Astrantia major 'Claret' & Salvia nemorosa 'Mainacht'-Piet Oudolf border-Toronto Botanical Garden

4. Alaskan burnet (Sanguisorba menziesii) & ‘Amethyst’ meadow sage (Salvia nemorosa).

Design-Salvia nemorosa 'Amethyst' & Sanguisorba menziesii-Piet Oudolf design-Toronto Botanical Garden

I’ll talk a little more about the wonderful burnets in Special Plants below, but this is a good early-summer combination: with zingy, dark-red Alaskan burnet (Sanguisorba menzisii) at rear, violet-mauve Salvia nemorosa ‘Amethyst’ in front, and a lttle spiderwort (Trandescantia) too. If you’re a bee-lover, the meadow sages are fabulous lures.

Design-Salvia nemorosa 'Amethyst' & Sanguisorba menziesii-Piet Oudolf border-Toronto Botanical Garden

5. ‘Concord Grape’ spiderwort (Tradescantia x andersoniana) & Knautia macedonica.

Design-Tradescantia 'Concord Grape' & Knautia macedonica-Piet Oudolf-Toronto Botanical Garden

Speaking of bees, both violet-purple spiderwort and dark-red knautia are excellent bee plants, but I do love these jewel-box colours together in early summer. The light-purple cranesbill is Geranium ‘Spinners’.

Design-Tradescantia 'Concord Grape' & Knautia macedonica-Piet Oudolf border-Toronto Botanical Garden

6. ‘Hummelo’ betony (Stachys officinalis)  & ‘Cassian’ fountain grass (Pennisetum alopecuroides).

Design-Stachys officinalis 'Hummelo' & Pennisetum alopecuroides 'Cassian'-Piet Oudolf design-Toronto Botanical Garden

Here are two of Piet’s German heritage plants growing side by side: Ernst Pagel’s lovely Stachys officinalis ‘Hummelo’ and the fountain grass named for Cassian Schmidt, director of Hermannshof.

Design-Stachys officinalis 'Hummelo' & Pennisetum alopecuroides 'Cassian'-Piet Oudolf-Toronto Botanical Garden

7. ‘Walker’s Low’ catmint (Nepeta racemosa) & ‘Cloud Nine’ switch grass (Panicum virgatum)

Design-Nepeta racemosa 'Walker's Low' & Panicum virgatum 'Cloud Nine'-Piet Oudolf design-Toronto Botanical Garden

Catmints are workhorses: long-flowering, great for bees, hardy, with tidy, aromatic foliage.  They do get big in time, but that just means more plants after dividing. Here it is as the switch grass (a warm season grass) is just getting going in early summer. It’s called ‘Cloud Nine’ for its impressive height, to 7 feet (2.1 metre).

Nepeta racemosa 'Walker's Low' & Panicum virgatum 'Cloud Nine'-Piet Oudolf Border-Toronto Botanical Garden

8. ‘Gentle Shepherd’ daylily (Hemerocallis) & ‘Purpurlanze’=’Purple Lance’ astilbe (A. chinensis var. tacquetii)

Design-Hemerocallis 'Gentle Shepherd' & Astilbe chinensis var. tacquetii 'Purpurlanze'-Piet Oudolf design-Toronto Botaniical Garden

When the entry walk garden first came into bloom in 2008, I was surprised to see a few daylilies in it. I suppose I thought that with Piet’s focus on the importance of good foliage, daylilies would simply not make the cut, given the tendency of their leaves to go brown and look straggly in late summer. But surprise! There are a few old-fashioned daylilies, including pale-yellow ‘Gentle Shepherd’ which makes a good companion to the fuchsia-pink flowers of spectacular ‘Purpurlanze’ astilbe and is considered a seasonal “filler” plant (see Scatter Plants and Fillers below), with other perennials emerging to carry on the late summer show.

Design-Hemerocallis 'Gentle Shepherd' & Astilbe chinensis var. tacquetii 'Purpurlanze'-Piet Oudolf border-Toronto Botanical Garden

9. ‘Blue Angel’ hosta (Hosta sieboldiana) & ‘Firedance’ mountain fleece (Persicaria amplexicaulis).

Design-Hosta sieboldiana 'Blue Angel' & Persicaria 'Firedance' - Piet Oudolf Design-Toronto Botanical Garden

Yes, Piet Oudolf uses hostas! (Shhh…don’t tell anyone….)  Actually, the big ‘Blue Angel’ hostas here are favourites of Piet’s for their beautiful leaf texture. They act as anchors (there’s one at the other end, too) for this long border. And when they’re flowering, there are always bees buzzing around the white blooms. I like the way the tall white burnet behind echoes the hosta flowers. These hostas also undergo their own foliage transformation, turning gold in autumn. The ‘Firedance’ mountain fleece or bistort (Piet’s introduction) is more compact than ‘Firetail’, and a good, long-flowering perennial.

Design-Hosta sieboldiana 'Blue Angel' & Persicaria 'Firedance'-Piet Oudolf border-Toronto Botanical Garden

A honey bee works the flowers of Hosta sieboldiana ‘Blue Angel’.

Honey bee on Hosta sieboldiana 'Blue Angel'

10. ‘Little Spire’ Russian sage (Perovskia atriplicifolia) & rattlesnake master (Eryngium yuccifolium)

Design-Perovskia 'Little Spire' & Eryngium yuccifolium-plan

This is one of my favourite combinations in the entire entry border: the yin-yang combination of the assertive, spiky rattlesnake master and the soft, hazy spires of Russian sage. Peeking through behind are more pink ‘Purpurlanze’ astilbe and ‘Gentle Shepherd’ daylilies.

Design-Perovskia 'Little Spire' & Eryngium yuccifolium-Piet Oudolf Entry border

11. Sea lavender (Limonium latifolium) and dense blazing star (Liatris spicata)

Design-Limonium latifolium & Liatris spicata-Piet Oudolf garden-Toronto Botanical Garden (2)

In writing in Hummelo: A Journey Through a Plantsman’s Life about their collaboration on the 1999 book Designing with Plants, Noel Kingsbury refers to a section of the earlier book called Moods. “We outlined the impact of the more subtle and hard-to-pin-down aspects of planting design, such as the play of light, movement, harmony, control and ‘mysticism’. I am still not 100 percent sure I know what we meant by this category, apart from a lot of mist in the pictures, but it looked good and sounded good.”  For me, the vignette below touches a little on mysticism. There’s something about this combination of forms — the solid echinaceas, the constellation of spent knautia seedheads, the regimental spikes of blazing star, the soft cloud of sea lavender, the blades of grass — that seems almost dream-like. This is my childhood meadow idealized.

Design-Limonium latifolium & Liatris spicata-Piet Oudolf garden-Toronto Botanical Garden (1)

12. ‘Royal Purple’ smokebush (Cotinus coggygria) & ‘Amazone’ Jerusalem sage (Phlomis tuberosa)

Design-Cotinus coggygria 'Royal Purple' & Phlomis 'Amazone-Piet Oudolf border-Toronto Botanical Garden

Once in a while, you might see a story (usually British) that refers to Piet Oudolf and the other practitioners of the so-called “Dutch Wave” of naturalistic design as focusing entirely on perennials to the exclusion of woody shrubs and trees.  If you don’t know Piet’s work with trees and shrubs (including roses) at The High Line and elsewhere, you won’t see the fallacy in that line of thought. Though the entry garden at the TBG is primarily a perennial meadow, there are shrubs and vines in a few places, including lilac (Syringa), Kousa dogwood (Cornus kousa), witch hazel (Hamamelis x intermedia), chaste-tree (Vitex agnus-castus) and purple-leaved smoke bush (Cotinus coggygria ‘Royal Purple’).  I love the vignette, below, with the burgundy-red foliage and smoky fruit of the smoke bush and the Phlomis tuberosa ‘Amazone’ with the tall alliums (likely ‘Gladiator’) and a sprinkle of white foxglove penstemon (P. digitalis), which is not on Piet’s plan but is now in the border and quite lovely in early summer.

Design-Cotinus coggygria 'Royal Purple' & Phlomis 'Amazone-Piet Oudolf design-Toronto Botanical Garden

Scatter Plants and Fillers 

In the book Hummelo: A Journey Through a Plantsman’s Life, by Piet Oudolf and Noel Kingsbury (The Monacelli Press, 2015), there are pages devoted to Piet’s use of “scatter plants” and “fillers”.  Scatter plants are defined as “individuals or very small groupings of plants interspersed among blocks of plant varieties or through a matrix planting, breaking up the regularity of the pattern; their distribution is generally quasi-random.”  Scatter plants can act as links in a border, even unifying it, adding contrasting splashes of colour, like the orange-red Helenium autumnale ‘Rubinzwerg’, below…..

Filler-Helenium 'Rubinzwerg'-Piet Oudolf border-Toronto Botanical Garden

…or a pop of colour that later disappears, like the Oriental poppies in the entry garden that later go dormant.

Papaver orientale 'Flamenco'

Fillers are plants whose interest lasts less than three months; though they may have good foliage, they don’t have the structure normally associated with an Oudolf design. They’re good for “filling gaps earlier in the year.” Knautia macedonica does this and cranesbills or perennial geraniums do, too. As Piet Oudolf and Noel Kingsbury wrote in Designing with Plants (Timber Press, 1999), “Think how quickly the neat hemispheres of a hardy geranium turn into a sprawling mass of collapsed stems once the flowers have died.” Yet, when in bloom, they give a starry effect, like the white form of mourning widow cranesbill (Geranium phaeum ‘Album’), below, twinkling among the opening blossoms of Paeonia ‘Bowl of Beauty’.

Filler-Geranium phaeum 'Album' & peonies-Piet Oudolf border-Toronto Botanical Garden

Grasses

If there’s a hallmark group of plants that defines a Piet Oudolf design, it is ornamental grasses. In fact, he and Anja believed so strongly in their value in gardens that they held an annual Grass Days at their garden in Hummelo. And the 1998 book Gardening with Grasses, co-written by Michael King and Piet Oudolf, advanced that respect. Among the grasses featured in the entry garden are:

1.‘Skyracer’ moor grass (Molinia arundinacea), shown here with ‘Gateway’ Joe Pye Weed (Eutrochium maculatum).  This grass is the perfect example of Piet’s use of plants that act as “screens and curtains”. In Designing with Plants, they’re described as “mostly air, and their loose growth creates another perspective as you look through them to the plants growing behind.” This rosy pairing, incidentally, also says ‘mysticism’ to me.

Grasses-Molinia caerulea 'Transparent' & Eutrochium 'Gateway'-Piet Oudolf border-Toronto Botanical Garden

2.‘Cassian’ fountain grass (Pennisetum alopecuroides), here with ‘FIretail’ red bistort (Persicaria amplexicaulis)

Pennisetum alopecuroides'Cassian' & Persicaria 'Firetail'-Piet Oudolf border-Toronto Botanical Garden

3. Korean feather grass (Calamagrostis brachytricha). Lovely and hardy as it is, its plumes gorgeous in late summer and autumn, this grass did exhibit a tendency to seed around in the entry garden at TBG and had to be watched carefully.

Grasses-Calamagrostis brachytricha-fall-Piet Oudolf border-Toronto Botanical Garden

Here is Korean feather grass in winter.

Grasses-Calamagrostis brachytricha-winter-Piet Oudolf border-Toronto Botanical Garden

4.Tufted hair grass (Deschampsia cespitosa) with sea lavender (Limonium latifolium)

Grasses-Piet Oudolf-Limonium latifolium & Deschampsia caespitosa-Toronto Botanical Garden

5.’Shenandoah’, a selection of the tallgrass prairie native switch grass (Panicum virgatum), here showing its reddish leaves.

Grasses-Panicum virgatum 'Shenandoah'-Switch grass-Piet Oudolf border-Toronto Botanical Garden

6.‘Strictum’ switch grass (Panicum virgatum) with its gold fall colour and seedheads of penstemon and echinacea.

Grasses-Panicum virgatum 'Strictum'

7. Northern dropseed (Sporobolus heterolepis), another tallgrass prairie native, its tiny, zingy flowers doing a dance with the small, pale-pink blossoms of North American native winged loosestrife (Lythrum alatum).  More on this perennial in the next section.

Grasses-Sporobolus heterolepis & Lythrum alatum-Piet Oudolf border-Toronto Botanical Garden

Native North American Plants

Mention of the little-known native winged loosestrife brings me to Piet Oudolf’s use of native North American plants. By the time he was commissioned to do the planting scheme for the TBG’s entry border in 2005-6, Piet had become friends with Wisconsin plantsman Roy Diblik, author of The Know Maintenance Perennial Garden, with whom he worked on Chicago’s Lurie Garden at Millennium Park. As we learn in Hummelo: A Journey Through a Plantsman’s Life, when they visited the Schulenberg Prairie together in 2002,  Roy recalls that Piet “was so taken with it. It was a very emotional moment for him.”  After visiting this prairie and the Markham prairie later that year, Piet began to use many more North American plants in his designs, including some of the less well-known species in my list below.

1.Winged loosestrife (Lythrum alatum) – Mention ‘purple loosestrife’ to ecologically-aware people and alarm bells ring. Try telling them that there IS a native purple(ish) loosestrife and they don’t trust you. Or it could mutate. Or it might really be that other one, the Eurasian invader that’s drying up wetlands everywhere (Lythrum salicaria).  But part of Piet Oudolf’s education with Roy Diblik was the discovery of this sweet plant. Native to moist prairies in Illinois and other parts of the northeast, it is at home in a well-irrigated garden where, rather than taking over like its cousin, it will work hard just to have its little pink flowers noticed.

Lythrum alatum-winged loosestrife

Here’s winged loosestrife with ‘Ice Ballet’ swamp milkweed (Asclepias incarnata). Both species are wetlanders, but do well in regular irrigated soil.

Native wetlanders-Lythrum alatum & Ascelpias incarnata-Piet Oudolf border-Toronto Botanical Garden

2. Swamp milkweed (Asclepias incarnata), shown above, is a larval plant for the monarch butterfly and a fabulous bee plant. The honey bee, shown below with two bumble bees, comes from the TBG’s five beehives and the Oudolf entry garden is a rich nectar source for them.

Natives-Bees on Asclepias incarnata 'Ice Ballet'

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Natives-Asclepias incarnata & carpenter bee

3. Leadplant (Amorpha canescens) – The soft drift of leadplant in the Oudolf entry garden, below, was my first acquaintance with this lovely tallgrass prairie native,one of a few true Ontario natives in the garden. Its common name refers to the old belief that its presence indicated that there were lead deposits nearby, but that was disproven long ago.  Its other folk names include downy indigobush (because it looks a little like indigofera) and buffalo bellows (because, to the native Oglala people who brewed it for a medicinal tea, it came into bloom when bison were in their bellowing-rutting season). A legume, it nitrifies the soil in which it grows (it’s usually considered a subshrub, rather than a perennial) and is one of the few natives that tolerates both dry soil and part-shade.

Natives-Amorpha canescens-leadplant-Piet Oudolf border-Toronto Botanical Garden

Bees love leadplant and its stamens provide a bright orange pollen. This is the brown-belted bumble bee (Bombus griseocollis).

Natives-Amorpha canescens & bumble bee

4. Dense Blazing star (Liatris spicata) – One of the best tallgrass prairie natives for any sunny border, dense blazing star is no stranger to European gardens either, since it’s been available there in the cultivars ‘Kobold’ (shorter and darker purple than the species) and ‘Floristan Violet’ for  decades. Like all Liatris species, it’s a great bee and butterfly plant and a good companion for echinaceas, including Piet Oudolf’s introduction below, ‘Vintage Wine’.

Natives-Liatris spicata & Echinacaea 'Vintage Wine'-Piet Oudolf introduction-Toronto Botanical Garden

Mention is often made of ‘repetition’ in a Piet Oudolf design and this rhythmic syncopation of blazing stars across the vignette below illustrates how those magenta-purple spikes help carry the eye naturally from one side to the other.

Natives-Liatris spicata-Yarrow-Perovskia-Knautia-Piet Oudolf border-Toronto Botanical Garden

5. Amsonias, Bluestars (Amsonia hubrichtii & Amsonia tabernaemontana var. salicifolia) – When I was writing my newspaper column in the mid-1990s, there was a sudden fuss about a genus of North American plants I’d never heard of. Amsonias were on the scene, and I planted Arkansas bluestar (A. hubrichtii) in my garden, which promptly turned up its toes and died. (It may have been a hardiness issue in an unusually cold winter, since this plant is native to the Ouachita mountains of Arkansas and Oklahoma.) Nevertheless, it gained traction in gardening circles and in 2011 was named the Perennial Plant Association’s Perennial of the Year.  This is how it looks in the Oudolf border with late spring bulbs.

Amsonia hubrichtii-Piet Oudolf Border-Toronto Botanical Garden

Arguably the brilliant yellow of the autumn foliage, below, is even more impressive than its ice-blue late spring flowers. Perhaps with our warmer winters, this species will continue to survive and thrive. 

Natives-Amsonia hubrichtii & Vitex agnus-castus-Piet Oudolf border-Toronto Botanical Garden

There are many species of Amsonia in commerce now, but willowleaf bluestar (Amsonia tabernaemontana var. salicifolia) is a good performer in the TBG entry garden and exceptionally hardy.

Natives-Amsonia tabernaemontana var. salicifolia

6.Joe Pye Weeds (Eutrochium sp., syn. Eupatorium) – The big Joe Pye weeds lend a powerful presence to the entry border in August and September, especially the statuesque ‘Gateway’ (Eutrochium maculatum) below. Given sufficient moisture, they thrive, last a long time in flower……

Natives-Eutrochium maculatum 'Gateway'-Piet Oudolf border-Tornto Botanical Garden

….. and attract myriad bees and butterflies to their dusty pink flowers.

Natives-Monarch butterfly on Eutrochium maculatum 'Gateway'-Piet Oudolf border-Toronto Botanical Garden

7. Wild petunia (Ruellia humilis) – Native to dry prairie glades in Wisconsin, Illinois and regions south and west, this short, sprawling perennial has lilac-purple, petunia-like blossoms that are beloved by hummingbirds.  Not showy, but a good little edge-of-path stalwart with a tap root. Self-seeds, too.

Natives-Wild petunia-Ruellia humilis-Piet Oudolf border-Toronto Botanical Garden

8. Anise hyssop (Agastache foeniculum) – One of the mainstays of Piet Oudolf’s designs is this aromatic North American Midwest mint family perennial with bee-friendly, lavender-purple flower spikes in mid-late summer. It spreads slowly by rhizomes.

Natives-Agastache foeniculum-Piet Oudolf border-Toronto Botanical Garden

Agastache foeniculum ‘Blue Fortune’ is an excellent selection with good winter presence.

Seedheads-Agastache 'Blue- Fortune'-Piet Oudolf-Toronto Botanical Garden

9. Bowman’s root (Porteranthus trifoliatus, syn. Gillenia trifoliata) – One of the most beautiful pictures in the entry border is right at the end (or beginning, depending which way you’re walking) where the path intersects with the entrance to the Floral Hall Courtyard. Here, in June, a starry cloud of Bowman’s root or Indian physic rises behind a skirt of Japanese hakone grass (Hakonechloa macra).  In its midst is a hybrid witch hazel which, though small now, will in time produce filtered shade under its boughs – and Bowman’s root is just fine in that light.

Natives-Porteranthus trifoliatus-Gillenia-Piet Oudolf border-Toronto Botanical Garden

Here it is with a few neighbours: Geranium psilostemon and Hosta sieboldiana ‘Blue Angel’.

Natives-Porteranthus tritrifoliatus-Hosta 'Blue Angel'-Geranium psilostemon-Piet Oudolf border-Toronto Botanical Garden

Special Plants

Sanguisorbas or Burnets – Piet Oudolf, more than any other plant designer, has made abundant use of the great genus Sanguisorba, the burnets.  Hardy, reliable and taking up much less space on the ground than their tall, far-flung inflorescences do in the air, they are a much underused group of perennials.  This is Sanguisorba tenuifolia ‘Alba’, or the white form of Chinese burnet, flowering alongside annual Verbena bonariensis.

Sanguisorba tenuifolia 'Alba'

Like Molinia caerulea ‘Transparent’, Chinese burnet is another good ‘screen’ or ‘scrim’ plant, even as its flowers fade. Here it is in front of Helenium autumnale ‘Fuego’.

Sanguisorba tenuifolia 'Alba'-Helenium 'Fuego'-Piet Oudolf Border-Toronto Botanical Garden

This is the purple-flowered form of Chinese burnet, Sanguisorba tenuifolia ‘Purpurea’, growing in an attractive combination with Joe Pye weed (Eutrochium sp.)

Sanguisorba tenuifolia 'Purpurea' & Eutrochium maculatum 'Gateway'-Piet Oudolf border-Toronto Botanical Garden

Even the skeletons look strange and wonderful in autumn.

Sanguisorba tenuifolia 'Alba'-autumn-Piet Oudolf border-Toronto Botanical Garden

Burnets are good wildlife plants, attracting bees to their abundant pollen…..

Honey bee on Sanguisorba tenuifolia 'Alba'

…. and birds to their seedheads in autumn. In my little video below, sparrows are enjoying the seeds of Sanguisorba tenuifolia ‘Alba’, while American goldfinches are feeding on the seed of an unlabelled burnet I suspect is Sanguisorba tenuifolia ‘Pink Elephant’.

Birds & Bees

Speaking of birds and bees, as a photographer of honey bees, bumble bees and various native and non-native bees, I’d be remiss if I didn’t pay tribute to just a few of the great pollinator plants in the Oudolf entry border (besides the ones above, of course).

Calamint (Calamintha nepeta ssp. nepeta) – Calamint is, without doubt, the ‘buzziest’ bee plant there is. The sound is really something, with honey bees and bumble bees all over the tiny flowers – and there are tons of tiny flowers on this bushy little perennial.

Honey bee on Calamintha nepeta ssp. nepeta

‘Walker’s Low’ catmint (Nepeta racemosa) – Long-flowering catmints are superb bee plants, putting out nectar beloved by bumble bees and honey bees.

Bumble bee on Nepeta racemosa 'Walker's Low'

Wlassov’s cranesbill (Geranium wlassovianum) – Previously unknown to me, this little Asian geranium has become one of my favourites. Not only does it flower for an incredibly long time and prefer filtered shade, its flowers are always dancing with bees and its leaves turn red in autumn.

Honey bee on Geranium wlassovianum

‘Robustissima’ Japanese anemone (Anemone tomentosa) – Japanese anemones are invaluable for their late summer-early autumn flowers, especially the singles like this lovely selection. And their stamens provide rich pollen at a time of year when bees are still looking to provision their nests.

Anemone 'Robustissima' and bumble bee

‘Autumn Bride’ alumroot (Heuchera villosa) – It’s fun to watch honey bees working the tiny white flowers of this fabulous late heuchera.

Honey bee on Heuchera villosa 'Autumn Bride'

Purple coneflower (Echinacea purpurea) – Echinacea and many of the selections are excellent bumble bee flowers, but they also provide abundant food for seed-eating birds like American goldfinch.  A good reason not to cut down your perennial garden in late summer!

Goldfinch-eating Echinacea seeds-Piet Oudolf border-Toronto Botanical Garden

Seedheads

While we’re on the topic of seedheads, one of the hallmarks of Piet Oudolf’s design philosophy is the use of plants that perform beyond their flowering season, with persistent stems and seedheads that provide structure in the garden into autumn and winter. These are just a few of the entry border’s distinctive seedheads:

Swamp milkweed (Asclepias incarnata) – The familiar chambered pods of milkweeds ripen, dry and split open in late autumn to reveal a layered arrangement of teardrop-shaped seeds topped by fine hairs. Over the next week or two, the seeds will gradually lift off on their silken parachutes, aloft on the wind to land on an empty inch of damp soil on which they’ll germinate the following spring. This is the milkweed life cycle that has evolved over millennia in all its regional species throughout North America in partnership with the monarch butterfly, whose females lay their eggs on the leaves, which then feed the developing caterpillar until it forms its chrysalis to emerge as the familiar orange-and-black butterfly we admire so.

Seedheads-Asclepias-Piet-Ou

‘Purpurlanze’ astilbe (Astilbe chinensis var. tacquetii) – I love the feathery bronze plumes of this Ernst Pagel-bred astilbe with the fountain grass (Pennisetum) behind.

Seedheads-Astilbe

Purple coneflower (Echinacea purpurea) – Long after the American goldfinches (above) have migrated south for the winter and the first snows have fallen, the raised seedheads of echinacea flowers still show their Fibonacci architecture.

Seedheads-Echinacea-Piet Oudolf-Toronto Botanical Garden

‘Fascination’ Culver’s root (Veronicastrum virginicum) – The coppery wands of spent Culver’s root look beautiful against the tawny grasses of late autumn.

Seedheads-Veronicastrum-virginicum-'F

Plants That Go, Plants That Come…..

Not all of the original plants in the design thrived beyond a few years. One that was quite short-lived was the beautiful ornamental clover (Trifolium rubens), with dark pink flowers, below.  In an ideal world, this plant would be allowed to self-seed, ensuring progeny for successive seasons. But it has petered out gradually.

Plants-short-lived-Trifolium rubens-Piet Oudolf border-TOronto Botanical Garden

Some of the yellow and orange hybrid echinaceas, like yellow ‘Sunrise’ shown in the early years with purple liatris, below, have also largely given up the ghost. Their lack of longevity (contrasted with the reliable long life of Piet’s Echinacea ‘Vintage Wine’) seems to be part-and-parcel of their genetic makeup, a fact Noel Kingsbury acknowleges in Hummelo: A Journey Through a Plantsman’s Life. “The 2000s saw a lot of breeding of E. purpurea with other Echinacea species, mostly in the U.S…… Some exciting color breaks – oranges and apricots – resulted, but the plants were mostly short-lived. For those wanting longer-lived plants, this breeding has not been of any use. We can only hope that someone picks up Piet’s work on longevity.”

Plants-Short-lived- Echinacea 'Sunrise'-Piet Oudolf borer-Toronto Botanical Garden

Unlike a traditional perennial bed or mixed shrub-perennial border with a modest number of plants, a broad meadow planting like the entry garden with its huge cast of flowery characters is an open invitation to opportunistic plants, good and bad. With so many gardens (including a natural woodland) surrounding the entry walk, it was inevitable that seeds would fly into the rich, irrigated soil – either on the wind, or carried by birds. One of the immigrants – from the green roof of the administration building – is  lovely foxglove penstemon, P. digitalis, a plant whose red-leafed form ‘Husker Red’ is used by Piet in his designs.  Easy, prolific. drought-tolerant and a great bumblebee and hummingbird plant, this penstemon’s shimmering white spikes are quite lovely in June. It’s one of my favourite perennials.

Penstemon digitalis-Piet Oudolf border-Toronto Botanical Garden

But there are also seeds that may have been in the soil for many years, just waiting to germinate. Such is the case with common milkweed (Asclepias syriaca), below, which I first spotted in my photos in 2011, four years after the garden was planted. Like Canada goldenrod, this is an aggressive native that spreads not only by seed, but by rhizomes underground.  Beautiful and fragrant as it is, is difficult to maintain a small population. And given that the better-behaved swamp milkweed (Asclepias incarnata) is here already and there are ‘wild’ places on the TBG property where common milkweed could be welcomed for its relationship to monarch butterflies, I hope it is kept in check so the design intent of the Oudolf garden is not lost.

Asclepias syriaca-common milkweed-Piet Oudolf border-Toronto Botanical Garden

Which brings me to maintenance. Toronto Botanical Garden currently operates on a financial shoestring. Unlike other popular parks and public places in Toronto, the TBG receives a pittance from the city. Hopefully, that will change in the near future as the City of Toronto Parks Department and the TBG conduct public consultations (two so far, one in November 2016, the last in late February) towards greatly increasing the size of the garden from the current 4 acres to 30 acres, placing all the current Edwards Gardens within a civically-supported Toronto Botanical Garden.  However, at the moment, the head gardener works with just a few assistants and a changing team of volunteers to maintain not just the entry garden, but the other 16 gardens on site, and one or two off-site.

Maintenance-Piet Oudolf Border-Volunteers-Toronto Botanical Garden

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For perspective, I chatted with Toronto Landscape architect Martin Wade of Martin Wade Landscape Architects, below right, who collaborated with Piet Oudolf, left, on the design of the entry border, which was gifted to the TBG by the Garden Club of Toronto.

Piet-Oudolf-Martin-Wade

Martin fondly recalled their first meeting.  “It was absolutely wonderful collaborating with Piet.  He is extremely down-to-earth, humble and generous.  I remember so clearly the very first time we met.  After picking him up at the airport, we came back to our house where my partner was preparing dinner.  It was shortly after we had moved in. I had not yet “done” the garden – it was a collection of plants left over from the previous owners. We were in the midst of a renovation and the place was in a bit of a shambles.  IKEA curtains hung to cover exposed plumbing, bare sub-floor in some areas, and yet with all of this, it was somehow as though we had known one another for ages   Piet sat down in a chair that had clearly seen better days and, over a single-malt whisky, the three of us talked about life in general and what our respective interests were. When I asked him what was important to him, he answered, without any hesitation, ‘Quality.  Quality in terms of food, wine, art, relationships, architecture, landscape, virtually everything in life.’  The notion of quality as being the driving force that stimulates him has stuck with me.”

Martin & I talked about maintenance. Unlike Chicago’s 2.5 acre Piet Oudolf-designed Lurie Garden (Landscape Architects: Gustafson Guthrie Nichol), which cost $12.5 million and has a $10 million endowment for maintenance alone, the TBG’s entry garden has no separate budget for maintenance. Similarly, unlike the Oudolf-designed Marjorie G. Rosen Seasonal Walk at the New York Botanical Garden, below, a much smaller garden which has the equivalent of half-a-full-time employee dedicated to maintenance (including the hedge), there is no dedicated employee budgeted for the TBG’s Oudolf garden. 

Marjorie J. Rosen Walk-New York Botanical Garden-Piet Oudolf Design

Before the entry garden was installed, Piet Oudolf, Martin Wade and the Garden Club of Toronto (GCT) had a frank discussion about long-term maintenance of the garden. By Piet’s estimate, the entry border would require a minimum of one full-time gardener dedicated to its upkeep. “As Piet explained,” recalls Martin, “His gardens, while ‘naturalistic’ and ‘meadow-like’ in appearance, are anything but low maintenance.  They require regular tending to keep species that were not part of the original design out. I have noticed the invasion of common milkweed in the garden.  This is a plant that has a host of great qualities and should be encouraged and let flourish in the right locations.  However, it was not part of the original plan.  The intent always was that the garden would be monitored yearly to ensure any of the more aggressive species in the plan were kept in check, and that the original plan be maintained, other than in the case of some species that just might not perform well, for which minor design adjustments would have to be made.  This ‘monitoring’ process involves taking a copy of the plan in hand, walking throughout the garden, making note of what has crept into areas in which it was not meant to, and making adjustments accordingly.” 

Sadly,” he continues, “I don’t think the garden is achieving to the full extent the goals that were envisioned when the project began.  I don’t mean this in any way as a criticism of the TBG or its staff, as I realize the extreme pressure they are under with respect to finances and resources that can be allocated to maintenance, not only of the entry garden, but all of their gardens.  Maintenance is such a huge issue for all gardens, private or public, not only for the TBG gardens.  It is relatively sexy these days to give a new building wing naming rights to honour the benefactor who helped make it a reality.  The same applies to gardens.  While a ‘sexy motive’ was not their intent, the Garden Club of Toronto was nonetheless very generous in gifting the Piet Oudolf/MWLA garden to the TBG.  That is their mandate.  The GCT funds public garden projects.”

Martin cites another of his projects to illustrate the level of financial commitment needed. “Our firm designed the Helen M. Kippax Garden at the Royal Botanical Garden in Hamilton.  The funds for this garden were donated by the late Mary Stedman in honour of her aunt Helen Kippax, one of the founding members of the Canadian Society of Landscape Architects.  Ms. Stedman’s donation is suitably honoured by a plaque in the garden.  She also had the foresight and financial ability to donate money to a trust fund, the interest from which is earmarked solely for the maintenance of the Kippax Garden.  We need these types of visionaries, and institutions need to find a way to raise money not only for the installation of our public gardens, but for their long-term maintenance.

Helen Kippax Garden-Royal Botanical Garden-Martin Wade Design

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But if the entry garden could use more a little more manpower to relieve the hard-working gardeners and volunteers, it is still, without a doubt, my favourite garden at the TBG. It takes me back to that childhood meadow I’ve carried in my heart for 60 years. It nourishes bees and butterflies and birds and the spirits of the visitors who walk the long path, flanked by a profusion of beautiful blossoms and swishing grasses.

Piet Oudolf Entry Garden-Toronto Botanical Garden-September

And in case you haven’t taken that walk yourself, let me leave you with a beautiful memory of a warm August afternoon in the entry garden at Toronto Botanical Garden. Thank you, Garden Club of Toronto. Thank you, gardeners. Thank you, Martin Wade. And thank you, Piet Oudolf.

29 thoughts on “Piet Oudolf: Meadow Maker – Part Two

  1. Thank you for this extremely detailed post, Janet. I particularly value the analysis of the many plant combinations Piet used, how they have fared over the years and–so important–the need for maintenance funds for these kinds of gardens. I’m working on several small garden designs now and your superb work has my mind buzzing with possibilities. This post records a part of the history of this movement that now will not be lost.

    • Thank you so much, James. Having photographed the plants and the border for a decade, I felt a debt to write about it so it IS on the public record. It is small, relatively-speaking, thus falls beneath the cracks of Piet’s bigger international installations, but it’s a jewel, and a revelation to many who haven’t seen what a garden ‘inspired by nature’ can be. Good luck with your designs!

  2. Wow, I’ve just spent a hour and more reading this and looking at your photos, making notes for plants to try. Thankyou for such an in-depth post Janet. I hope better funding comes soon.

  3. A great post Janet and such a satisfying read on a dreary, cold March day. Thank you for a thoughtful deconstruction of the garden. Examining discrete combinations is both informative and inspiring. The garden design is so complex that it is often difficult to focus on specific plants and easy to be overwhelmed by the exuberance of the plants. Your article sheds light on the brilliance of the design. Another huge thank you for tackling the prickly subject of maintenance as the garden matures. The preservation of the Oudolf/ Wade original design is so important.

    • Thank you, Sara. Yes, ‘drilling down’ to the individual components makes it more digestible. Especially in thinking about applications for small gardens.

  4. Love this, thank you! I have been researching the characteristics of Piet Oudolf as I get ready to dig out most of my garden and start from scratch. This is very helpful. Your photos were very helpful. You’re such an amazing photographer – no ordinary person could capture these distinguishing characteristics as you could.

    • Thank you so much, Wendy, for those lovely words! Be sure to have a look at Part One, with more ‘all-over’ shots. Excited for your new book! (Wish you were going to be at the Bloggers’ Fling in DC!)

    • Thank you, Helen! I know you’ve made the garden your own muse from time to time, so we share an affinity for meadows. And yes, hundreds more photos……. 🙂

  5. Wow! I have not had the opportunity to visit the TBG entry garden through the seasons, as I live outside of Toronto. However, I will now make an effort to do so. I have Piet Oudolf’s books and have been a fan of his work – both in terms of plant breeding and landscape design – for sometime. My dream is to visit his own garden in Hummelo, the High Line in New York and the Lurie Garden in Chicago. I pored over your photos and descriptions of the plant combinations, and made notes about ones I could try in my own garden. Many, many thanks for both of these articles. Nothing better on a chilly spring day that to dream of the drone of insects in a beautifully designed garden.

    • Thank you, Ingrid! For sure you need to visit the High Line! It’s become a vital part of New York City’s fabric. And yes, try to get to the TBG throughout the season; there’s something educational throughout late spring, summer and autumn.

  6. Thank you Janet! I have so enjoyed spending time looking and pouring through your amazing images and learning more of Piet Oudolf and his great talent with landscape design and plant combinations. I do have a couple of his books, however, since shifting they remain packed away somewhere deep in a shipping container of boxes.
    I’m very interested in his style of planting and since moving to this new property my husband and I intend to create meadow gardens in a similar style to his. We live on the Southern Downs in Queensland, Australia, with cool winters and very hot summers so it will be a challenge indeed re the perennials that can cope with temps that can go from -7C to 22C on a winters day and into the 40’sC in the summer. I’m in the process of building up a perennial nursery at the moment and learning masses after living for years in a subtropical climate where we owned and ran nurseries for many years.
    Thank you once again for the beautiful way you expressed the inspiring work of Piet Oudolf.

    • Thanks so much, Linde. I’m glad you got something useful out of our Toronto experience. Perhaps there are native meadow plants that would work with some of Piet’s palette? In the same way that he learned about some good North American prairie plants, you might incorporate some bee-friendly Australian meadow plants in your design. Best of luck!

  7. Dear Janet:
    Thank you for these remarkably informative posts on Piet Oudolf and the meadow garden at the TBG. Your thoughtful and beautifully realized writing and visuals are greatly appreciated. The details you included and your gorgeous photos and videos have helped me so much as I visualize the gardens and learn from his work. I especially appreciate the information on the budgeting for maintenance and how a design should be managed over a long-term to retain its integrity or morph into another state of enhanced natural beauty. I am so glad I have found your site!

    • Thank you, Traci, for your kind words. I’m so happy you’re inspired by Piet’s ethos and lovely garden, and the more pragmatic details of maintaining this kind of design. All the best!

  8. This is the most detailed description of Piet Oudolf’s work I have seen. Thank you. It seems like the plant choice is mostly suited for northern climates. I am wondering how to use this style in the Mediterranean climate (Southern-Europe / Southern-California) where the use of many ornamental grasses and dried seedheads are fire hazards. I am wondering how I can get the same dreamy effect here…

    • Anna, my best advice is to join the group Dutch Dreams on Facebook. It’s dedicated to landscapes designed by Piet and other Dutch and international garden designers. There are members there from Mediterranean climates who can help fine-tune a plant palette that relies less on grasses and seedheads, I’m sure.

  9. Hi there, I have just gotten interested in gardening this past year and have very recently discovered Piet Oudolf. I have two of his books already which are ok but actually your page is exactly what I was hoping would be in the books. Thank you so much for putting this together for us! I will definitely be using this as inspiration. I also love that this is the Toronto garden and that I will not have to worry about adapting the planting to my zone as I am in the GTA 🙂

    • Thank you, Melanie! What a lovely way to become interested in gardening, via Piet Oudolf’s work. Do try to get to the High Line in New York and Battery Park, as well as the Toronto Botanical Garden, of course. And if you’re on Facebook, join the “Dutch Dreams” group to be inspired by this kind of meadow movement, especially from the European view.

  10. Really appreciate your post! I’ve got a notebook full of ideas, combinations and plants that I love from afar. I’m installing a Piet Oudolf-inspired garden next month at our home in Denver. I devoured your every detail and photo. Thank you!

    • Jennifer, so happy you enjoyed it and good luck with your Denver meadow! Hopefully you’ll find room for lots of penstemons. When I returned from Colorado, I had serious penstemon envy (another blog post of mine!)

  11. I own most of Piet’s books and have been studying up the past several months in preparation for planting a prairie meadow in our backyard, but, as others have said, this analysis was exactly what I needed: Understanding more about the combinations of plant, the interplay and how one plant can become the perfect backdrop for another, etc. Thank you so much for your time and expertise, and for sharing this!

  12. Thank you so very much for the wonderfully detailed descriptions of the plants and the harmonies. It must have taken quite some effort and I hope to pass on the kindness it required to share this information for the benefit of all.

    • Thank you for the kind words, Ellie. It was a great pleasure to create this blog – and yes, it took some effort and the kindness of friends who loaned me the photos of the garden’s installation. Be sure to see my blogs on the High Line, the Lurie and Oudolf Field – via the search box.

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