Originally Posted by aruzinsky

I am acting on the theory that a very fluffy, loose, potting mix is best because it will accommodate root expansion. I want the roots to not force the potting mix over the rim of the pot. Toward this end, I use a mix of approximately 1 part parboiled rice hulls, 2 parts peat moss and a small amount (by weight) of unmilled sphagnum moss. The sphagnum moss makes the mix very airy while increasing its water holding capacity.

For this mix, a fertilizer that contains calcium should be used because the mix contains no lime.