Take Cuttings - It's easy to take cuttings of established succulents growing in your garden. With small pruning snips, cut stem sections 1-2 inches long. Remove lower leaves. (Roots will sprout from these leaf nodes.) Let cuttings dry on a tray for a few days before you plant them. This curing process causes cut ends to callus (form a thin layer of cells). "It's OK if the cuttings shrivel up a little bit." - Great idea for a garden swap with your friends and neighbors!
Aspirin is the remedy for fungal plant problems, Black spot, powdery mildew, and rust are a terrible trio of fungi, which can attack and destroy your plants. Scientists have found that two uncoated aspirin tablets (325 milligrams each) dissolved in 1 quart of water and used as a foliar spray can thwart these diseases. I have not tried this, but I will.