I have received six tubers of this terrestrial orchid native to Japan where
it is known as the Egret Orchid. It is also known taxonomically as pecteilis
radiata.

Do any of you have experience growing these? I've found only two references
to culture on the web. One grower reported limited success growing in
sphagnum. Another site said part to full sun in well-drained, acidic soil
kept moist until after flowering is completed and the plants go dormant. Any
other suggestions for success?

Except for Bletilla striata, I grow all my orchids in pots and in the
winter, indoors.