I just saw that nobody's responded in a couple days...I can't really help much, but I can tell you that I have gazanias and I hardly ever fertilize them, and I also see them used in median strips and places like that where they probably don't get much fertilizer either. So I don't know if they really need much, but if you give them any they don't need anything special, just use whatever you're using on the rest of your garden.