A dose of liquid fertilizer every few weeks will keep them healthy into fall. Containers fend off heat and wind better if several are arranged close together. Direct contact can destroy tiny feeder roots. Shield container plants from midsummer heat by using a lattice, awning, umbrella or shade fabric. Potting soil can be used two or three years, unless plants become diseased.
Results are best if the soil is changed every year, however.
To save money, replace only the top half of the soil layer in deep pots. Most plants, especially annuals, require at least six to eight hours of sunlight per day. Position containers accordingly. For hanging wire baskets, use large containers. A thick layer of sphagnum moss won't dry out as quickly, and heavier baskets can better withstand windy days.