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Posts Tagged ‘OvS’

Dicentra eximia 'alba'

Dicentra eximia 'alba'

Native Range: Eastern North America

USDA Hardiness: 3-9

Height: 12″-18″

Growing Conditions: Part shade; moist, rich soils

Who ever heard of a Bleeding Heart blooming from spring into October?  Dicentra eximia ‘alba’ is one of the few woodland wildflowers with such a long bloom time.  We recently fell for its long-blooming delicate dangling white flowers when we planted it for a Native Garden at the New York Botanical Garden.  Its lush, fern-like foliage interplants easily with native woodland sedges and ferns and makes it a wonderfully versatile plant.  We have also recently paired it with Phlox subulata ‘Emerald Blue’ in the shady interior courtyard of a mixed-use building near the National Cathedral here in Washington, DC.

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Carex elata

Carex elata in bloom this week in an OvS-designed estate in coastal Maine (photograph courtesy Rebecca Hoffman)

While gathered around the lunch table with co-workers today, the conversation turned, as it so often does, to plants. Today’s conversation included a lament that straight species are frequently ignored by the nursery trade in favor of more showy cultivars. Setting aside discussions of wildlife value and attractiveness to pollinators, today’s discussion was about aesthetics. “Sometimes you just need the basics,” one co-worker announced.

Carex elata is an example of just such a plant.  Not to be outshown by its more widely cultivated chartreuse form, ‘Bowles Golden’, the straight species of Carex elata has found a welcome home in many OvS gardens over the years. Eric Groft and Wolfgang Oehme first happened upon the straight species decades ago at Holgar Winenga’s Garden Treasure Nursery. I vividly remember the fury of Wolfgang Oehme when a truckload including thousands of cheerily glowing ‘Bowles Golden’ arrived at a prominent federal project we were working on, instead of the specified straight species. “They look sick,” snapped Wolfgang as he ordered the plants returned. No intense yellow sedges here!

The straight species features graceful, slender, emerald-green blades. Clusters of deep brown seed capsules shoot like fireworks off the stems in mid-April. When planted in mass, Carex elata forms a dense waving sea of green by early summer.  The versatile plant performs well in sun or shade, moist or dry conditions. “It’s a miracle plant!” declares OvS principal Eric Groft. Carex elata demonstrates just how beautiful and dynamic the basics can be.

Native Range: Northern and eastern Europe

USDA Hardiness: Zones 5-9

Height: 18-30”

Growing Conditions: Full sun to part shade; normal to moderately moist soils

Carex elata

Seed capsules in mid-April mingle with Narcissus ‘Golden Bells’ in an OvS-designed walled garden on the Eastern Shore of Maryland

Carex elata

Carex elata planted in mass provides visual relief from the exuberance of an elaborate English border in an OvS garden on the Eastern Shore of Maryland

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Sanguinaria canadensis

Sanguinaria canadensis

A walk through an eastern woodland in early spring is a treasure hunt for me. Only in this short window of time, before deciduous trees leaf out and while the sun still reaches the forest floor, does one have the opportunity to discover the fleeting blooms of our native spring ephemerals. This weekend, I spied some of the earliest of these, a happy colony of Bloodroot, its blossoms grouped in a gleaming white bouquet.

Bloodroot’s flower buds emerge in early spring wrapped tightly in a leaf that shares their same stem and that may help to trap warmth. The showy clear white blossoms with yellow stamens open in the sun and close at night.  Bloodroot’s large leaves fully unfurl after the flowers fade. The leaves are strongly textural with deep clefts, and they in turn disappear in mid-summer when bright sunlight no longer reaches the forest floor. The metaphorical common name derives from the reddish sap exuded by the roots and stems of the plant when cut.

Last spring, OvS planted Bloodroot in several of our projects, tucking the low plants close to woodland paths amongst a richly textured groundplane of ferns and sedges like Dryopteris marginalis and Carex plantaginea that fill in as Bloodroot goes dormant. This spring, I am thrilled to watch as these delicate woodland beauties have their day in the sun.

Native Range: Eastern North America

USDA Hardiness: zones 3-8

Height: 6”-9”

Growing Conditions: Moderate to full shade; moist, well-drained soils

Sanguinaria canadensis

Detail of Sanguinaria canadensis 'Bloodroot'

 

Sanguinaria canadensis

Sanguinaria canadensis after blooming

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Edgeworthia papyrifera (Paperbush)Native Range: China

USDA Hardiness: Zones 7-9

Height: To 7’

Growing Conditions: Light to moderate shade; deep, moist, high organic matter soils

Though this has been a particularly mild winter in Washington DC, I still find myself watching intently for signs of spring.  This week, the Paperbush outside my front door has rewarded me by unfurling its unusual spherical yellow flowers.  The dangling blossoms hang like large pendants from the bare stems. Welcome spring!

Paperbush’s silvery leaves emerge after it is done blooming and are reminiscent of Frangipanis. DC is near the northern edge of Paperbush’s hardiness range, and through the spring, summer, and fall it looks like its tropical cousins. Its graceful, vaselike form, smooth reddish bark, and prominent buds that form in late summer keep gardeners enticed through the winter. At OvS, we use it as a stand-alone specimen shrub in spots where it will be sure to be appreciated in late winter (near a front door or sunny terrace, or prominently visible outside an important window). Its sweet fragrance fills the air and gives all who pass by a breath of spring.

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Hibiscus moscheutos 'Plum Crazy'

Hibiscus moscheutos 'Plum Crazy'

Native Range: Eastern North America

USDA Hardiness: 4-9

Height: 48″

Growing Conditions: Full sun; moist soils

This showy cultivar of one of our regionally native perennials has found its way into several of OvS’ recent gardens.  Its large, vivid, plum-colored flowers steal the show when in bloom (July through frost).  We were surprised however by its bold-textured purple foliage that is a striking complement to tall ornamental grasses.

We planted it recently on a waterfront estate on the northern neck of Virginia, where it contrasts nicely with Panicum virgatum and Eupatorium ‘Bartered Bride’.  Swamp mallow is native to the edges of salt marshes and freshwater wet meadows throughout the east coast, but has also found a happy home in the moist, rich garden soil of several of our townhouse gardens.

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Amsonia tabernaemontana 'Blue Ice'

Amsonia tabernaemontana 'Blue Ice'

Native Range: Eastern North America

USDA Hardiness: 5-9

Height: 12″-24″

Growing Conditions: Part shade; moist soils

Though best known for its dense clouds of vivid blue flowers in the early spring, this woodland native has proved a beautiful plant throughout the growing season in several of Oehme, van Sweden’s recent projects. Its blue-tinged, finely textured foliage and compact habit make it an excellent companion for woodland sedges and ferns. It also glows an eye-catching golden gold in the autumn landscape.

We planted it this spring with Carex appalachicain the new Native Garden at the New York Botanical Garden and are already impressed by its large blue-green sweeps through the dry woodland.

Amsonia tabernaemontana 'Blue Ice'

Eastern Bluestar in bloom

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On November 5, OvS Principal Sheila Brady spoke on “Distilling the Essence of Native Landscapes” at the Phipps Conservatory in Pittsburgh. Sheila’s talk was part of the Conservatory’s Native Plant and Sustainability Conference, an annual event celebrating native plants and sustainable landscape management.

Sheila’s presentation focused on Oehme, van Sweden’s work on the New Native Plant Garden at the New York Botanical Garden. In a significant departure from the habitat-based model that has shaped many previous native gardens, the approach to the New Native Plant Garden distilled the visual essence of the region’s native landscapes without replicating them. Sheila highlighted the diversity of native plants that were included in the garden, and the selection and enhancement of patterns from nature.

Joining Sheila as presenters at the Conference were Patrick Cullina, Vice President of Horticulture and Park Operations for the High Line elevated park in New York City; Dr. Linda Johnson, Professor of Plant Sciences, Ecology and Native Plant Communities at Chatham University; and Dr. Carol Mapes, Professor and Chair of the Biology Department at Kutztown University of Pennsylvania.

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