Nervilia holochila on my place grows in colonies along the creek but mostly closer to the edge of the watercourse where drainage is better (when it's not flooding). But it does still get flooded a number of times during the wet season. There's also a smaller colony further from the creek which would be in soggier ground. Close to Darwin (Holmes Jungle) I've seen colonies on the edge of monsoon forest where they get good light but drainage is better. Mine are under tree canopy, but not real dense.
