Hi Mary Sue, I use granite chicken grit, which is probably much the same as decomposed granite I buy 50# bags at the local feed store for $5.50. My preference is for grower grit Turkey is too big and starter is too small, though I sometimes use it in seed mixes. Anything I pot up has at least 1 part in 4 of this stuff, most bulbs have at least 1 part in 3. I've just started using traction sand in pots of succulents and some larger aridland bulbs (Rauhia, for instance). I like the look and the texture, but it will be a while before I know if its really beneficial. Lisa