Only real differencei is the amount of perlite and sand. Buy the garden soil, a bale of Sphagnum Peat, bag of perlite and a bag of play sand and mix your own. Doesn't hurt to add blood and bone meal as well. My beds get a generous layer of mulched leaves and grass clippings from the compost bin in the fall. Springtime I till that in along with composted cow manure, peat, sand, perlite and vermiculite. Rg