Winter Hardiness And Sun Tolerance - Knowledgebase Question

Eugene, OR
Question by cdrtadpole
August 27, 2002
I cannot find winter hardiness nor sun tolerance for an australian tree fern. It is 4' tall potted, and I want to plant in ground on East exposure, in zone 7. I have raised it on a covered patio for 2 years, and need to transplant as it is getting quite large!There is a honey locust within 10 feet but not covering area I wish to put the fern tree. Can I do this, as we do get some night temps in the low 30's and high 20's. Thank you. Connie


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Answer from NGA
August 27, 2002

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Cyathea cooperi is the Australian Tree Fern. It's hardy to 20F but may suffer some damage to the fronds. If you prune off winter damaged fronds the plant will generate new fronds. It will eventually reach 20' high and about 12' wide, so be sure to give it ample growing room. Provide your tree with partial afternoon shade for best growth. If you can situate it within the shade your honey locust casts during hot summer afternoons it will be quite happy. Best wishes with your tree fern.

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