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PlantFiles: Black Stem Maidenhair, Giant Maidenhair, Australian Maidenhair
Adiantum formosum

Family: Pteridaceae
Genus: Adiantum (ad-ee-AN-tum) (Info)
Species: formosum (for-MOH-sum) (Info)


18-24 in. (45-60 cm)
24-36 in. (60-90 cm)
36-48 in. (90-120 cm)

Unknown - Tell us

USDA Zone 9b: to -3.8 C (25 F)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)

Sun Exposure:
Partial to 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:
From spores

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

Click thumbnail
to view:

By kennedyh
Thumbnail #1 of Adiantum formosum by kennedyh

By kennedyh
Thumbnail #2 of Adiantum formosum by kennedyh

By BayAreaTropics
Thumbnail #3 of Adiantum formosum by BayAreaTropics


1 positive
1 neutral
No negatives

Gardeners' Notes:

Neutral Cretaceous On Apr 21, 2007, Cretaceous from El Sobrante, CA (Zone 9b) wrote:

Native to Australia and New Zealand.

Positive BayAreaTropics On Jun 20, 2006, BayAreaTropics from Hayward, CA wrote:

My short time with having this fern outdoors in the S.F. bay area is that it perfectly hardy, although slow to establish. Planted from a pot late summer last year,it is just sending up the larger,beefier,croziers. A big difference in size.


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

Hayward, California

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