Species Orchid, Cypripedium, Limestone Loving Cypripedium, Yellow Lady's Slipper

Cypripediumcalceolus

Family
Orchidaceae (or-kid-AY-see-ee)
Genus
Cypripedium (sip-rih-PEE-dee-um)
Species
calceolus (kal-KEE-oh-lus)
Synonym
Calceolus alternifolius
Calceolus marianus
Cypripedium atsmori
Cypripedium microsaccos
Sun Exposure
Sun to Partial Shade
Foliage
Deciduous
Smooth
Height
12-18 in. (30-45 cm)
Spacing
12-15 in. (30-38 cm)
Hardiness
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)
Danger
Parts of plant are poisonous if ingested
Handling plant may cause skin irritation or allergic reaction
Bloom Color
Maroon/Burgundy
Bloom Time
Late Spring/Early Summer
Other Details
Category
Perennials
Water Requirements
Average Water Needs; Water regularly; do not overwater
Foliage Color
Where to Grow
Bloom Characteristics
Bloom Size
Other details
Soil pH requirements
Patent Information
Propagation Methods
Seed Collecting
Regional

This plant is said to grow outdoors in the following regions:

Wellesley Hills, Massachusetts

Chaska, Minnesota

Bay Village, Ohio

Featured Videos

Gardener's Notes:

3
positives
2
neutrals
0
negative
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A
(Zone 6b) | February 2016 | positive

Cypripedium calceolus is a native orchid here in Austria and I often found it in woodlands on higher elevations. They bloom in May and June

E
calgary, AB (Zone 3b) | June 2015 | neutral

My neighbor cut out several plants from her mothers garden in Sylvan Lake Alberta zone 3b where she has a large well established grouping...Read More

L
Moose Jaw, SK (Zone 3b) | May 2005 | positive

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

O
Dundee, OH (Zone 5b) | April 2004 | positive

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.

B
B
Baa
| August 2001 | neutral

This terrestrial orchid has a wide natural distrbution ranging between North America, Europe and Asia. Has 3-4, slightly downy, ovate ri...Read More

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