Mildew problems on zinnias can be reduced if you begin regular spraying with a fungicide now. Follow label instructions. Keep color coming on annual flowers by applying a general garden fertilizer at package-recommended rates. Deadhead to encourage more blossoms and improve appearance. Caterpillars of butterflies and moths can be a problem on tomatoes and vegetables.
Several insecticides are available.
It takes longer to act than chemicals but affects only caterpillars. Some types of perennials can be dug, divided and replanted. These include day lilies, peonies and irises. Any planting should be complete by mid-September to give the plants time to establish good root systems before cold weather arrives. Look for gypsy moth egg masses.