It depends on what you want to do with it. It will cover the medium on any pot of CPs you choose to put it on. But, if you want to raise it just to have more sphagnum, I would suggest that you get some dried long fiber sphagnum, line a large undrained container with it, place your growing sphagnum in the dried stuff, and then fill the container with water up to the level of the sphagnum. Put it outside in good sun or inside under your lights. It'll grow over the entire surface eventually and you can divide it into other containers. I'm filling my Nep tanks with sphagnum in this manner.