Answer: Cyathea cooperi, the Austrailian Tree Fern, is the fastest growing of all the tree ferns and would be a good choice for your growing region. It thrives in full sunshine, but will get along well in partial shade. The plant starts out as a low, wide clump before it begins growing upward. Expect Cyathea to grow from 1'- 3' per year.
Dicksonia, the Tasmanian Tree Fern, prefers shade but will grow well in your mild temperature summer season if given 4-6 hours of sunlight. It's the hardiest of tree ferns, tolerating cold temperatures of 20 degrees F. It grows slowly, eventually reaching 15' in height with many arching, 3-6' fronds. The fronds are more finely cut than those of the Austrailian Tree Fern.
Either tree fern will adapt to the growing conditions you describe.
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