This looks like a twisted version of a bird’s nest fern. It wants slightly more light than most ferns and lots of water like all ferns do.
The height is about 18″, the spread is the same. We are at the edge of where it will grow so plan to protect it in the winter, or plant it close to the house. Enough heat leaks out of most homes in the winter to protect smaller plants that only need a little help.
Plant in part to full shade and keep moist in the summer, slightly less water is needed in the winter. This one died during a summer drought.
Propagate by division. This plant should slowly spread through the garden itself.
I had trouble finding information on this fern, I’ll post more information as I can find it. I acquired this at Jerry’s Jungle.
Did not survive below freezing temps winter 2011