Hawaii's Most Invasive Horticultural Plants

   
Australian treefern
Sphaeropteris cooperi

(Photo credit: Haleakala National Park Resources Management Division)


Other names:Cyathea cooperi
Description: Tree fern up to 40' high, similar to hapu'u but distinguished by the brown fuzz at the base of the fronds being in the form of scales instead of hairs; also the leaves of mature plants tend to be in a tight rosette at the top of the plant instead of more spread out along the trunk.
Risk areas: Rainforest, moist forest, openings in wet and moist areas.
WARNING:Native hapu'u ferns can be planted instead of Australian treefern. Be aware, though, that the trunks of hapu'u often contain a variety of invasive alien plants, like Himalayan raspberry, growing on them and these could be a source of inadvertent introduction of noxious weeds onto your island. Examine all hapu'u used and remove clinging vegetation.

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