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Orchid, Lady Slipper, Cypripedium Ulla Silkens

Cypripedium

Family: Orchidaceae (or-kid-AY-see-ee) (Info)
Genus: Cypripedium (sip-rih-PEE-dee-um) (Info)
Grex name:Ulla Silkens
Additional cultivar information:(Cyp. flavum X Cyp.reginae)
Hybridized by Petersen
Registered or introduced: 1996

Category:

Perennials

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Flowers are good for drying and preserving

Water Requirements:

Requires consistently moist soil; do not let dry out between waterings

Where to Grow:

Grow outdoors year-round

Height:

6-12 in. (15-30 cm)

12-18 in. (30-45 cm)

18-24 in. (45-60 cm)

Spacing:

18-24 in. (45-60 cm)

Hardiness:

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:

Light Shade

Danger:

Handling plant may cause skin irritation or allergic reaction

Bloom Color:

Pink

White/Near White

Bloom Time:

Late Spring/Early Summer

Foliage:

Herbaceous

Leathery-Textured

Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:

Non-patented

Propagation Methods:

By dividing rhizomes, tubers, corms or bulbs (including offsets)

Seed Collecting:

N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

Regional

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

Kenosha, Wisconsin

Gardeners' Notes:

0
positives
1
neutral
0
negatives
RatingContent
Neutral

On Jul 29, 2016, coriaceous from ROSLINDALE, MA wrote:

From Tony Avent's wonderful essay on growing hardy ladyslippers http://www.plantdelights.com/Article/Cypripedium-Lady-Slippe... :

"This vigorous, stunning 1996 hybrid from Svante Malmgren is a cross of the American Cypripedium reginae x the rare Chinese Cypripedium flavum. Cypripedium 'Ulla Silkens' is much easier to grow than its parents and will take a good bit of sun in cooler climates, but still prefers moist alkaline soils. The 2' tall flowering stalks that appear in mid-to late-June are topped with huge slippers of burgundy and white, backed by three large pure white sepals. The clumps will become quite large with nearly 100 flowers per clump. (Hardiness Z... read more

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