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Cyathea brownii

 
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Family: Cyatheaceae
Genus: Cyathea (sigh-ATH-ee-uh) (Info)
Species: brownii (BROW-nee-eye) (Info)

Synonym:Alsophila excelsa
Synonym:Sphaeropteris excelsa

7 members have or want this plant for trade.

Category:
Tropicals and Tender Perennials
Ferns

Height:
15-20 ft. (4.7-6 m)
20-30 ft. (6-9 m)
30-40 ft. (9-12 m)
over 40 ft. (12 m)

Spacing:
8-10 ft. (2.4-3 m)
10-12 ft. (3-3.6 m)
12-15 ft. (3.6-4.7 m)

Hardiness:
USDA Zone 9a: to -6.6 °C (20 °F)
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:
Sun to Partial Shade
Light Shade
Partial to Full Shade

Danger:
Unknown - Tell us

Bloom Color:
Inconspicuous/none

Bloom Time:
N/A

Foliage:
Grown for foliage
Evergreen

Other details:
Requires consistently moist soil; do not let dry out between waterings
This plant may be considered a protected species; check before digging or gathering seeds

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information:
Non-patented

Propagation Methods:
From spores

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
Thumbnail #1 of Cyathea brownii by palmbob

By palmbob
Thumbnail #2 of Cyathea brownii by palmbob

By Cretaceous
Thumbnail #3 of Cyathea brownii by Cretaceous

By Cretaceous
Thumbnail #4 of Cyathea brownii by Cretaceous

By Cretaceous
Thumbnail #5 of Cyathea brownii by Cretaceous

By Cretaceous
Thumbnail #6 of Cyathea brownii by Cretaceous

By Cretaceous
Thumbnail #7 of Cyathea brownii by Cretaceous

There are a total of 9 photos.
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Profile:

2 positives
1 neutral
No negatives

Gardeners' Notes:

RatingAuthorComment
Neutral Cretaceous On Apr 7, 2007, Cretaceous from El Cerrito, CA (Zone 9b) wrote:

Cyathea brownii is reputed to be the largest living species of tree fern, and can attain a height of over 40 feet.

It is listed in the 1997 IUCN Red List of Threatened Plants as vulnerable.

Available from Thimble Farms, B.C., Canada.

Cyathea are listed on CITES Appendix II.

Positive BayAreaTropics On Sep 24, 2005, BayAreaTropics from Hayward, CA wrote:

It is also a much darker green than the Australian tree fern when grown in light shade. Hard to find..got mine at a botanical garden sale. It has grown from a seedling (frondling?) to 6 foot spread in 4 years-and only two of those in ground. And it does like fertilizer more than the common tree ferns.Yet,still does not develop the massive trunk as it does in it's natural habitat. And i have noticed that for a large fern it has a tendency to only send up only one frond at a time.
EDIT: Sailed through the 07 freeze. It even threw out a frond or two over the winter-well,the second frond is still a crozier. But,I'm not so sure i would call it a fast growing tree fern.
EDIT2: After a slowing down period it has taken off again. Even the crown seems to be too large for the trunk to hold up..I understand that is a result of low humidity and fast growth.Hey,it's a living thing making its own rules...
2008: This fern continues to ad bulk and now shows the crown of fronds of an adult C.brownii. That is,unlike most other Cyatheas, C.brownii fronds are held up right in a vase shape much like the Dicksonia's.In coastal areas and coastal valleys it may be capable of ,maybe prefer, full sun. It's a big fern.
How this can be confused with C.cooperia or even be said to be a variant of cooperi is a wonder. They look nothing alike.

Positive palmbob On Aug 24, 2003, palmbob from Tarzana, CA (Zone 9b) wrote:

For those who love tree ferns, but can't wait for your Australian tree fern to get to any size, or shade your yard, this is the fern for you (one of several). This is 3x as fast a grower, and larger and better looking than an Australian tree fern (Cyathea cooperi), except for the Brentwood variety- that one is faster and larger still. This has a darker trunk and slightly more sun tolerance. However, full sun is only recommended in moderately cooler climates. Blazing heat, like seen inland in Southern California, will toast any tree fern. Then shade is recommended.

Regional...

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

Encino, California
Hayward, California



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