Photo by Melody

PlantFiles: Species Orchid, Giant Helleborine, Giant Stream Orchid, Epipactis
Epipactis gigantea

Family: Orchidaceae (or-kid-AY-see-ee) (Info)
Genus: Epipactis (ep-ih-PAK-tiss) (Info)
Species: gigantea (jy-GAN-tee-uh) (Info)
Grex name: Serpentine Night

Synonym:Amesia gigantea
Synonym:Arthrochilium giganteum
Synonym:Epipactis americana
Synonym:Epipactis pringlei
Synonym:Helleborine giganteum

One vendor has this plant for sale.

9 members have or want this plant for trade.


18-24 in. (45-60 cm)

15-18 in. (38-45 cm)

USDA Zone 7b: to -14.9 C (5 F)

Sun Exposure:
Full Sun


Bloom Color:

Bloom Time:
Late Spring/Early Summer
Mid Summer

Grown for foliage

Other details:
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater
Suitable for growing in containers

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
By dividing the rootball
By dividing rhizomes, tubers, corms or bulbs (including offsets)
From herbaceous stem cuttings
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; sow indoors before last frost
By simple layering
By air layering
By tip layering
By stooling or mound layering

Seed Collecting:
Unknown - Tell us

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There are a total of 10 photos.
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1 positive
No neutrals
No negatives

Gardeners' Notes:

Positive Slipperman On Jun 9, 2008, Slipperman from Portland, OR wrote:

This plant is a great hardy orchid for those interested in growing such plants. In the wild it grows next to streams in sunny breaks in the forest. It's range is from the interior mountains of Oregon California, Washington and BC to the coastal headlands and river valley. It is very adaptable and will form a large clump if it has sufficient water. The specific Serpentine Night cultivar was found just north of the Bay area in California. It is a little bit more touchy than the green form. This is not actually the Giant Heleborine Epipactis which is from europe and is invasive here in the U.S.


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

Albany, California
Eureka, California
Oakland, California
Kalamazoo, Michigan
Lake Oswego, Oregon
Portland, Oregon

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