Crabgrass is one of the most troublesome weeds throughout the U.S. Although known as a lawn weed, it is frequently found in gardens and in cracks in sidewalks and driveways. Crabgrass is most troublesome in hot, dry weather. The pale bluish-green blades, 1/3 inch wide and 2 to 5 inches long, may be slightly hairy. Seedheads grow from the center of the plant from July to October. The plants are killed by the first fall frost, but seeds remain dormant over the winter, then sprout in the spring. Plants grow in broad, flat clumps that crowd out desirable plants.
The many fibrous roots make this weed difficult to remove by digging.