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PlantFiles: Species Orchid, Yellow Lady's Slipper Orchid, Limestone Loving Cypripedium
Cypripedium calceolus

Family: Orchidaceae (or-kid-AY-see-ee) (Info)
Genus: Cypripedium (sip-rih-PEE-dee-um) (Info)
Species: calceolus (kal-KEE-oh-lus) (Info)

Synonym:Calceolus alternifolius
Synonym:Calceolus marianus
Synonym:Cypripedium atsmori
Synonym:Cypripedium microsaccos

7 members have or want this plant for trade.


12-18 in. (30-45 cm)

12-15 in. (30-38 cm)

USDA Zone 3a: to -39.9 C (-40 F)
USDA Zone 3b: to -37.2 C (-35 F)
USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:
Sun to Partial Shade

Parts of plant are poisonous if ingested
Handling plant may cause skin irritation or allergic reaction

Bloom Color:
Maroon (Purple-Brown)

Bloom Time:
Late Spring/Early Summer


Other details:
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
Unknown - Tell us

Seed Collecting:
Unknown - Tell us

Click thumbnail
to view:

By OhioBreezy
Thumbnail #1 of Cypripedium calceolus by OhioBreezy

By Lilypon
Thumbnail #2 of Cypripedium calceolus by Lilypon

By Lilypon
Thumbnail #3 of Cypripedium calceolus by Lilypon

By Lilypon
Thumbnail #4 of Cypripedium calceolus by Lilypon

By Lilypon
Thumbnail #5 of Cypripedium calceolus by Lilypon

By absinthe27
Thumbnail #6 of Cypripedium calceolus by absinthe27


2 positives
1 neutral
No negatives

Gardeners' Notes:

Positive Lilypon On May 11, 2005, Lilypon from Moose Jaw, SK (Zone 3b) wrote:

A very showy yellow ladyslipper that seems to be particularly easy to grow. I purchased a mature three eyed division from seed raised plants.

Please do NOT collect this plant from its' native habitat.

Positive OhioBreezy On Apr 30, 2004, OhioBreezy from Dundee, OH (Zone 5b) wrote:

I found this to be a very pretty color and it grew well this year despite last winter's very cold temps!!! I had 2 plants bloom yellow this year.

Neutral Baa On Aug 31, 2001, Baa wrote:

This terrestrial orchid has a wide natural distrbution ranging between North America, Europe and Asia. Has 3-4, slightly downy, ovate ribbed leaves up to 8 inches long. The flower is 3 inch across and a reddish-purple/brown with an inflated round lip.

Flowers May-June. Loves moist, fertile, leafy, humus rich, slightly alkaline soil.

Even though it has a wide distribution in lime rich woods and meadowlands, it is always rare in the area it is in.

Please buy these from a reputable source who does not harvest from the wild.


This plant has been said to grow in the following regions:

Wellesley Hills, Massachusetts
Chaska, Minnesota
Bay Village, Ohio

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