I mix some sand and pumice in with the potting soil (usually Black Gold). I don't keep track of proportions... I just kinda of stir it up and "eyeball it". Right now I don't have many semps in pots but am planning for more, if you call "table gardening" a pot. This is where you don't really use a pot, but plant right on a surface using rocks or whatever as a container. Big plans going through my brain now.
