I purchased some sarr rhizomes and I need to know how deep in the medium to plant them. My medium is about 40% peat, 40% perlite, and 20% sphagnum moss. I put a layer of moss in the bottom of the pot to prevent soil loss through the drainage holes. I keep the pot in a tray of distilled water (I've learned a lot on this wacky site). I just want to make sure I don't plant too deep or shallow.