Photo by Melody

PlantFiles: Species Orchid, Lady Slipper Orchid, Large Flowered Cypripedium
Cypripedium macranthos

Family: Orchidaceae (or-kid-AY-see-ee) (Info)
Genus: Cypripedium (sip-rih-PEE-dee-um) (Info)
Species: macranthos (mak-RANTH-os) (Info)

Synonym:Cypripedium neoparviflorum
Synonym:Cypripedium rebunense
Synonym:Cypripedium speciosum
Synonym:Cypripedium thunbergii

8 members have or want this plant for trade.


6-12 in. (15-30 cm)

9-12 in. (22-30 cm)

USDA Zone 2a: to -45.5 C (-50 F)
USDA Zone 2b: to -42.7 C (-45 F)
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)

Sun Exposure:
Light Shade

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

Bloom Color:
Magenta (Pink-Purple)

Bloom Time:
Mid Spring
Late Spring/Early Summer


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

Soil pH requirements:
5.1 to 5.5 (strongly acidic)
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)

Patent Information:
Unknown - Tell us

Propagation Methods:
By dividing rhizomes, tubers, corms or bulbs (including offsets)
From seed; germinate in vitro in gelatin, agar or other medium

Seed Collecting:
Allow pods to dry on plant; break open to collect seeds

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to view:

By Terri1948
Thumbnail #1 of Cypripedium macranthos by Terri1948

By Dosetaker
Thumbnail #2 of Cypripedium macranthos by Dosetaker

By KWoods
Thumbnail #3 of Cypripedium macranthos by KWoods

By saanansandy
Thumbnail #4 of Cypripedium macranthos by saanansandy


2 positives
No neutrals
No negatives

Gardeners' Notes:

Positive dave12122 On Aug 13, 2011, dave12122 from East Haddam, CT wrote:

I have found this species one of the easiest ladyslippers to cultivate. It is more forgiving of less than perfect conditions, and grows perfectly well in a leafy, duffy mixture, with some shade during the afternoon hours. Mine have bloomed every year, and are slowly making offsets. I believe the hardiness info here is incorrect, this should be hardy from zones 4-8, and if deeply mulched, possibly zone 3.

Positive tinkabell On Apr 23, 2010, tinkabell from Rhoadesville, VA wrote:

I have these all along my driveway, in various colors of pink as well as a very few I understand it they are all protected and should not be moved or bothered. One thing I have been told is that they need a very specific fungus in the soil to grow? If this isn't present...they will NOT grow which is one reason to leave them alone. Mine do produce seed but I am not sure exactly what they need and so I just leave them alone so that they hopefully will continue to thrive. They are also picky about the amount of sunlight and warmth.


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

Dayville, Connecticut
East Haddam, Connecticut
Prospect, Kentucky
Greenville, New Hampshire
Charlestown, Rhode Island
Foster, Rhode Island
Blacksburg, Virginia
Rhoadesville, Virginia

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