Problem: Nutsedge (Lawns)
Cyperus species Nutsedge, also called nutgrass, is a hard-to-kill perennial weed. Both yellow and purple nutsedge are common weeds. Nutsedge reproduces by underground stems, seeds, and tubers. The tubers, the size of popcorn kernels, sprout in late spring and early summer. The plant tops die back in the fall, leaving new tubers in the soil to repeat the cycle the following year. The tubers and underground stems are firmly anchored in the ground. When a plant is pulled up, some of the tubers and underground stems are left behind to resprout into new plants.
Nutsedge is difficult to control. When the weeds have died after treatment, reseed the dead areas.