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PlantFiles: Ram's Head Lady Slipper Orchid
Cypripedium arietinum

 
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Family: Orchidaceae (or-kid-AY-see-ee) (Info)
Genus: Cypripedium (sip-rih-PEE-dee-um) (Info)
Species: arietinum (air-REE-tee-num) (Info)

2 members have or want this plant for trade.

Category:
Perennials

Height:
6-12 in. (15-30 cm)

Spacing:
9-12 in. (22-30 cm)

Hardiness:
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)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)

Sun Exposure:
Light Shade

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

Bloom Color:
Pink

Bloom Time:
Mid Spring
Late Spring/Early Summer

Foliage:
Herbaceous

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

Click thumbnail
to view:

By rcn48
Thumbnail #1 of Cypripedium arietinum by rcn48

By Equilibrium
Thumbnail #2 of Cypripedium arietinum by Equilibrium

Profile:

No positives
3 neutrals
No negatives

Gardeners' Notes:

RatingAuthorComment
Neutral maureen1952 On May 23, 2008, maureen1952 from Worcester, MA wrote:

I believe this is an endangered orchid. It should be reported at least to you local or state horticulture society as to location and SHOULD NOT be moved unless in danger of being destroyed.

Neutral rcn48 On Dec 19, 2004, rcn48 from Lexington, VA (Zone 6a) wrote:

We were fortunate to capture photos of this rare orchid on a botanical field trip to Bruce Peninsula, Ontario in June. Scattered throughout a park at Singing Sands, we found as many as 15-20 plants growing under the canopy of low growing yews.

Neutral smiln32 On Aug 19, 2002, smiln32 from Oklahoma City, OK (Zone 7a) wrote:

The specific epithet arietinum is the Latin meaning "like a ram," in reference to the fanciful similarity of the flower of this species to a ram's head.

Regional...

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

,
Farmington, New Hampshire



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