I have the opposite problem.. it's basically sand. So all the goodness just runs straight through. I have a lot of broms and natives and still constantly have to work with the soil. There are parts of my yard that are like beach.. I've mixed cement with it.We have the same problem here, so year after year I have been adding perlite, peat moss, compost, and a manure/humus mix when I work up the soil- that and building raised beds for better drainage. So far, so good.