Photo by Melody

PlantFiles: Subarctic Ladyfern, Western Lady Fern
Athyrium filix-femina subsp. cyclosorum

Family: Dryopteridaceae
Genus: Athyrium (uh-THEE-ree-um) (Info)
Species: filix-femina subsp. cyclosorum

Synonym:Athyrium filix-femina var. californicum
Synonym:Athyrium filix-femina var. cyclosorum
Synonym:Athyrium filix-femina var. sitchense
Synonym:Athyrium cyclosorum

One member has or wants this plant for trade.


24-36 in. (60-90 cm)
36-48 in. (90-120 cm)
4-6 ft. (1.2-1.8 m)

4-6 ft. (1.2-1.8 m)

USDA Zone 8a: to -12.2 C (10 F)

Sun Exposure:
Full Sun
Sun to Partial Shade
Light Shade
Partial to Full Shade
Full Shade

Unknown - Tell us

Bloom Color:

Bloom Time:

Grown for foliage

Other details:
Unknown - Tell us

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
Unknown - Tell us

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

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By Cretaceous
Thumbnail #1 of Athyrium filix-femina subsp. cyclosorum by Cretaceous

By Cretaceous
Thumbnail #2 of Athyrium filix-femina subsp. cyclosorum by Cretaceous

By Cretaceous
Thumbnail #3 of Athyrium filix-femina subsp. cyclosorum by Cretaceous


1 positive
1 neutral
No negatives

Gardeners' Notes:

Positive kerrybee On Jun 29, 2010, kerrybee from Astoria, OR wrote:

Grows huge in Pacific NW including Oregon coast. Grows well in pots but size may be restricted. Potted, prefers part or light shade, unless you can keep soil moist which during hot windy days may require twice daily watering. In moist ground, wind sheltered, light shade with filtered sun, my original mother plant is 5 ft wide, 5 ft tall. Deer resistant. Keep dead fronds over plant during winter until spring fiddleheads are about 4 to 6 inches tall. Can be invasive, but that is also a matter of preference. I love and collect fern species and to me, the "volunteers" are free plants.

Neutral Cretaceous On Jun 3, 2007, Cretaceous from El Sobrante, CA (Zone 9b) wrote:

Native to western Canada, and Alaska and coastal California in the USA.


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

Bellevue, Washington

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