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PlantFiles: Grub Fern, Caterpillar Fern
Polypodium formosanum

 
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Family: Polypodiaceae
Genus: Polypodium (pol-ee-POD-ee-um) (Info) (pol-ee-POD-ee-um) (Info)
Species: formosanum (for-MOH-sa-num) (Info)

Synonym:Goniophlebium formosanum
Synonym:Marginaria formosana
Synonym:Polypodiodes formosana
Synonym:Polypodium liukiuense

Category:
Ferns
Epiphytes

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

Spacing:
Unknown - Tell us

Hardiness:
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:
Partial to Full Shade

Danger:
Unknown - Tell us

Bloom Color:
Inconspicuous/none

Bloom Time:
N/A

Foliage:
Grown for foliage
Evergreen

Other details:
Average Water Needs; Water regularly; do not overwater

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 palmbob
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By mrao77
Thumbnail #7 of Polypodium formosanum by mrao77

Profile:

3 positives
2 neutrals
No negatives

Gardeners' Notes:

RatingAuthorComment
Positive mrao77 On May 3, 2009, mrao77 from Plano, TX wrote:

I found the rhizomes of this fern the most interesting, especially since the plant was lableled "E.T fern"!! It was a P.formosanum 'cristatum'. Not sure if it was just a sales gimmick or a new cultivar. if anyone has more info, please share.

Positive CpB On Jan 3, 2009, CpB from Loma Mar, CA wrote:

Old fronds will shrivel and brown in late summer. I cut them off in order to make room for fresh growth which will begin immediately. Hard to overwater in a basket where this subject undoubtedly does best. Rhizomes will begin to shrivel if let dry out too much, but will come back immediately when watered. Avoid full scorching sun. Best in filtered to bright (but still filtered) light. Mine is huge after a number of years and I have found it hard to kill. Most fronds spore bearing. In my experience this is an easy fern.

Neutral BayAreaTropics On Dec 7, 2008, BayAreaTropics from Hayward, CA wrote:

NOT an easy to grow fern. It has a dormant period that occurs seemingly sporadic. I know some have had great success at keeping it growing,but overall not a sure thing.
A challenge.

Neutral Cretaceous On Jun 13, 2007, Cretaceous from El Cerrito, CA (Zone 9b) wrote:

Native to Japan, Taiwan, and China.

Positive palmbob On Feb 8, 2004, palmbob from Tarzana, CA (Zone 9b) wrote:

Good hanging basket fern from the orient. Leaves drop up to 2' and the rhizomes have an ornamental sea green to nearlyl white coloration.

Regional...

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

Loma Mar, California
San Francisco, California
Jacksonville, Florida
Plano, Texas



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