They may have already eaten most of your lily foliage and are now moving on to other things. Diazinon is labeled for grasshopper control. There are several colorful annuals and perennials available at the local garden centers. Many, such as zinnias, marigolds, periwinkle, salvia, portulaca, and celosia require minimum care while rewarding you with brilliant summer color. The trick to successfully growing annuals is to prepare the area prior to planting.
Most annuals prefer a well-drained soil in full sun.
Some annuals will grow in partial shade but may be more weak and spindly with fewer flowers. Some shade tolerant flowering annuals and perennials are balsam, begonia, crossandra, impatiens, and streptocarpus. Summer weather is not especially friendly to most of our favorite vegetables . Two major setbacks for summer gardens are insects and diseases. It is hard to effectively control insect pests and diseases without encountering an expense.