I'm sure I'm not the only one who has noticed when repotting that some plants seem to have been grown when very small in some spongy oasis-like substance. It seems pretty durable and I've found it at the center of the root mass of plants obviously 3-4 years old, maybe even older. It seems to be a little less dense and airier than oasis, a little spongy in fact. Anyone have any idea what this stuff is? I'm considering testing it for small seedlings from compot and seeing how it works. But I'd have to know what is is and where to get it first.