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Cypripedium acaule (Pink Lady’s Slipper Orchid)

Moccasin Flower, Pink Lady's Slipper Orchid, Fissipes acaulis

Cypripedium acaule, Moccasin Flower, Pink Lady's Slipper, Fissipes acaulis, Pink Flowers, Hardy Orchids
Cypripedium acaule, Moccasin Flower, Pink Lady's Slipper, Fissipes acaulis, Pink Flowers, Hardy Orchids

Long-lived (up to 20 years), Cypripedium acaule (Pink Lady’s Slipper Orchid) is a hardy orchid boasting deep rose, light pink or white flowers with darker pink venation, 2 in. across (5 cm). They feature an inflated pouch backed by lance-shaped, greenish-brown sepals and petals that spread out. Blooming from mid-spring to mid-summer (depending on geographic locations), the sophisticated flowers are borne singly at the top of erect leafless stalks. They rise well above a basal set of 2 opposite dark green leaves with conspicuous parallel veins. Both exotic and beautiful, this woodland wildflower takes several years to go from seed to mature plants. It should not be picked in the wild, propagates poorly, and is very difficult to grow in wildflower gardens.

  • Grows up to 12-18 in. tall and wide (30-45 cm).
  • Thrives in part shade in moist, acidic, well-drained soils
  • No serious pest or disease issues. Very difficult to transplant.
  • The entire plant is hairy and has been known to cause dermatitis on those trying to dig it from the wild.
  • Native to eastern North America.

Requirements

Hardiness 3 - 7
Heat Zones 1 - 7
Plant Type Orchids, Perennials
Plant Family Orchidaceae
Genus Cypripedium
Exposure Partial Sun
Season of Interest Spring (Mid, Late)
Summer (Early, Mid)
Height 1' - 2'
(30cm - 60cm)
Spread 1' - 2'
(30cm - 60cm)
Spacing 24" (60cm)
Maintenance Low
Water Needs Low, Average
Soil Type Clay, Loam, Sand
Soil pH Acid, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Showy
Native Plants United States, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, New Hampshire, Delaware, Maryland, Maine, Connecticut, Massachusetts, Southeast, Midwest, Northeast, Illinois, Indiana, Wisconsin, Ohio, Michigan, Minnesota, Tennessee, Virginia, West Virginia, South Carolina, Kentucky, North Carolina, Alabama, Georgia
Garden Styles Prairie and Meadow, Informal and Cottage
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Alternative Plants to Consider

Cypripedium macranthos (Lady’s Slipper Orchid)
Cypripedium Monto gx (Lady’s Slipper Orchid)
Cypripedium Hank Small gx (Lady’s Slipper Orchid)
Cypripedium tibeticum (Tibetan Lady’s Slipper Orchid)
Cypripedium x ventricosum (Lady’s Slipper Orchid)
Cypripedium guttatum (Spotted Lady’s Slipper Orchid)

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Cypripedium (Lady Slipper Orchid)
While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.
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Requirements

Hardiness 3 - 7
Heat Zones 1 - 7
Plant Type Orchids, Perennials
Plant Family Orchidaceae
Genus Cypripedium
Exposure Partial Sun
Season of Interest Spring (Mid, Late)
Summer (Early, Mid)
Height 1' - 2'
(30cm - 60cm)
Spread 1' - 2'
(30cm - 60cm)
Spacing 24" (60cm)
Maintenance Low
Water Needs Low, Average
Soil Type Clay, Loam, Sand
Soil pH Acid, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Showy
Native Plants United States, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, New Hampshire, Delaware, Maryland, Maine, Connecticut, Massachusetts, Southeast, Midwest, Northeast, Illinois, Indiana, Wisconsin, Ohio, Michigan, Minnesota, Tennessee, Virginia, West Virginia, South Carolina, Kentucky, North Carolina, Alabama, Georgia
Garden Styles Prairie and Meadow, Informal and Cottage
How Many Plants
Do I Need?
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