Photo by Melody

PlantFiles: Delta Maidenhair Fern
Adiantum raddianum

Family: Pteridaceae
Genus: Adiantum (ad-ee-AN-tum) (Info)
Species: raddianum (rad-dee-AH-num) (Info)

Synonym:Adiantum cuneatum
Synonym:Adiantum decorum
Synonym:Adiantum amabile
Synonym:Adiantum boliviense
Synonym:Adiantum colpodes

6 members have or want this plant for trade.

Tropicals and Tender Perennials

12-18 in. (30-45 cm)
18-24 in. (45-60 cm)

18-24 in. (45-60 cm)

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)
USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:
Light Shade

Unknown - Tell us

Bloom Color:

Bloom Time:

Grown for foliage

Other details:
This plant is suitable for growing indoors
Requires consistently moist soil; do not let dry out between waterings

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
By dividing the rootball

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

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There are a total of 9 photos.
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4 positives
1 neutral
No negatives

Gardeners' Notes:

Positive annlof On Feb 4, 2011, annlof from Camarillo, CA wrote:

Slugs love the newly-opened fronds. But this fern is so beautiful that I still have to grow it... I've had good results growing the ferns in pots with copper stripping under their rims. My plants have experienced temps down to about 40 degrees without any negative effects.

Positive BayAreaTropics On Sep 18, 2008, BayAreaTropics from Hayward, CA wrote:

What's interesting about this cultivar is that it grows true from spore. My orginal plant died a decade ago and still spore sprout on lava rock leaning into my fish pond in shady areas. And so do a few other Adiantum species self sow. It could be called "Bonsai Maidenhair" as it is a very delicate looking miniature of the normal A.raddianum. Large ones are striking floating clouds of fronds.

Positive Cretaceous On Feb 17, 2007, Cretaceous from El Sobrante, CA (Zone 9b) wrote:

This fern has done well on our front porch, where it is shaded from the sun and protected from strong winds. Needs to be sprayed daily with filtered water, and fed (diluted fish emulsion) about every two-three weeks. Protect from slugs and snails. The Delta Maidenhair Fern is commonly found for sale in plant nurseries locally.

This plant is native to Costa Rica, Nicaragua, Mexico, Dominica, Jamaica, Trinidad and Tobago, Venezuela, Brazil, Bolivia, Colombia, Ecuador, Peru, Argentina, Paraguay, and Uruguay.

Positive nevadagdn On May 6, 2005, nevadagdn from Sparks, NV (Zone 7a) wrote:

This plant overwintered for me, snow and all! I'm guessing hardiness may reach all the way to 8a. I have it tucked into a little "bog pocket" at the side of my above-ground pond, which never freezes solid in winter because I keep the pump running. I was very surprised to see new fronds emerging this Spring. I assume that the splash from the pond "waterfall" and ambient humidity that close to the water help me to grow this plant in otherwise arid Nevada.

Neutral ladyannne On Oct 11, 2004, ladyannne from Merced, CA (Zone 9a) wrote:

We almost lost this one due to overwatering. It seems to like being much drier than the average bear.


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

El Cerrito, California
Hayward, California
Merced, California
San Francisco, California
Ventress, Louisiana
Sparks, Nevada

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