Many plants are susceptible to verticillium wilt (including maple, strawberry, tomato, and impatiens). Avoid growing the same type of annuals in the same location year after year. Symptoms of verticillium include wilting, stunting, leaf drop, and stem death. If you notice these symptoms in impatiens and have planted them in the same location for several seasons, consider a different annual for that site for the next couple of years. Other shade-tolerant annuals that are immune to verticillium wilt include begonia, lobelia, pansy, and sweet alyssum. Some resistant perennial plants to consider include astilbe, columbine, coral bells, and ligularia.