Before applying any type of pesticide or herbicide your landscaper should properly identify the type of weeds present in your yard. Most weeds have distinct characteristics pertaining to growth habits and appearance. Common weeds include: annual weeds, winter annuals, summer annuals, perennials, broad leaf weeds, and grasses. Annual weeds live for one year and will germinate from seed. Crabgrass is an annual weed that can be prevented by planting healthy sod in bare patches, cutting your lawn at 2