Disa uniflora comes from south africa, and is commonly seen growing with Drosera capensis and other sundews in its natural habitat. They prefer purified water, but can tolerate a low dose of fertilizer.
In the wild, they are found growing in pure sphagnum, and in cultivation, a 60% sphagnum/40% perlite mix works well. I water them like cephalotus-they don't like having wet feet, but the medium cannot dry out either.
These terrestrial orchids are great companions with Darlingtonia, Cephalotus, and highland nepenthes. They love being kept on the cooler side, but are frost sensitive. Here's some photos for you to enjoy : http://www.flickr.com/photos/6300022...7626949306893/