This Grassy weed Is Not Technically a Grass; It's a Sedge and Is Very Difficult to Control
Nutsedge, also known as nutgrass, is a perennial, grass-like weed that seeks out the moist, poorly drained sections of your yard or garden and grows faster in hot weather than our lawns. Its leaves are grasslike and yellow-green, while the spiky head is purple or yellow. It's a tough weed to control because it grows from tiny tubers, or nutlets, that form on roots that can grow 8-14 inches deep in the soil. Pull out the roots and some tubers will stay behind to grow. Individual nutsedge plants may eventually form patches of 10 feet or more in diameter.