When does the stream orchid bloom?

Epipactis gigantea typically flowers from June through August, with exact timing depending on elevation and how much moisture is available at the site.

What pollinates the stream orchid?

Bees and flies visit the flowers of Epipactis gigantea. Some flies are drawn in by the flower's resemblance to aphids, a form of mimicry that has been studied in this species.

How much water does Epipactis gigantea need?

This orchid needs consistently moist to wet soil and is usually found near seeps, springs, streambanks and hot spring margins where water is reliably available through the growing season.

How much light does the stream orchid prefer?

Stream orchid does best with part sun to part shade, and can tolerate fairly shaded streamside sites as long as soil moisture stays high.

Does the stream orchid lose its leaves in winter?

Yes, Epipactis gigantea is deciduous. The above-ground growth dies back after the growing season and returns from rootstock the following spring.

Is Stream Orchid HOA-friendly?

Stream Orchid takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

Stream Orchid

Name: Pollinator Patch
Author: Pollinator Patch

Epipactis gigantea

Last reviewed: August 2026

Epipactis gigantea, the stream orchid, grows in seeps, streambanks and springs across the western United States, blooming from June through August with greenish flowers marked in purple-brown.

Toxicity unknown

Stream Orchid (Epipactis gigantea) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.

Light

part sun

Water

high

Size

12"–36" H × 8"–18" W

Bloom

Jun, Jul, Aug

Native to

AZ, CA, CO, ID and 10 more states

Pollinators

bees, flies

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Browse plants for this ecoregion

Coast Range Marine West Coast Forest Northwestern Forested Mountains Sierra Nevada Central California Foothills and Coastal Mountains Southern California Mountains North American Deserts Central Basin and Range Mojave Basin and Range Southern Rockies Arizona/New Mexico Mountains Chihuahuan Deserts Southwestern Tablelands Cross Timbers Edwards Plateau Texas Blackland Prairies Madrean Archipelago Sonoran Basin and Range Southern California/Northern Baja Coast

Stream orchid is a native wetland perennial that produces elegant spikes of greenish-purple flowers in summer. This moisture-loving plant thrives in consistently wet soils and partial shade, making it ideal for bog gardens or stream edges.

Growing Stream Orchid

Grow Stream Orchid in part sun and high water. Mature plants reach 12 to 36 inches tall and spread 8 to 18 inches wide. Expect high maintenance to keep it looking intentional in a front yard.

In an HOA neighborhood

Stream Orchid takes more care to keep looking intentional in a front yard. Maintenance level: high. Consider it for backyard or mid-zone beds rather than the street edge.

Works well in: backyard only.

Requires very wet conditions that may create drainage concerns
Wild orchid appearance may seem too naturalistic for formal landscapes
Specialized growing requirements make it difficult to maintain consistently

Wildlife value

The flowers attract bees and flies during the summer blooming period. As a native orchid, it provides specialized habitat value for native pollinators.

Common questions

When does the stream orchid bloom?: Epipactis gigantea typically flowers from June through August, with exact timing depending on elevation and how much moisture is available at the site.
What pollinates the stream orchid?: Bees and flies visit the flowers of Epipactis gigantea. Some flies are drawn in by the flower's resemblance to aphids, a form of mimicry that has been studied in this species.
How much water does Epipactis gigantea need?: This orchid needs consistently moist to wet soil and is usually found near seeps, springs, streambanks and hot spring margins where water is reliably available through the growing season.
How much light does the stream orchid prefer?: Stream orchid does best with part sun to part shade, and can tolerate fairly shaded streamside sites as long as soil moisture stays high.
Does the stream orchid lose its leaves in winter?: Yes, Epipactis gigantea is deciduous. The above-ground growth dies back after the growing season and returns from rootstock the following spring.
Is Stream Orchid HOA-friendly?: Stream Orchid takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

These answers were drafted with an AI model from this plant's data. Verify care details with a local expert.

Native range data from vouchered herbarium specimen records and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

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