I posted this question before, but didn't get any response, soooo, I'll try again. I'm puzzled by the growth habit of my h. difformis. It grows up from the substrate about 2 inches, then parallel to the gravel for an inch or so, then up to the surface again. This makes for some very interesting S-shaped stems, though it is not quite what I was hoping for. Any explanations? Bill Cwirla Hacienda Heights, CA