Crabgrass is a grassy weed that often becomes problematic in lawns and gardens, particularly in lawns that are not well cared for. They are annual plants, and one plant is capable of producing 150,000 seeds per season. The seeds germinate in the late spring and early summer and drive out the desired plants-domesticated lawn grasses, vegetable plants, etc.-and expand outward in a circle up to 12 inches in diameter. In the fall, when the plants die, they leave large voids in the lawn, which become prime areas for crabgrass seeds to germinate the following season. Crabgrass, because its color and texture differ from those of the usual grass in landscapes, also interrupts the uniformity of a lawn. Crabgrass can be controlled with pre-emergent herbicides.