Another undesirable grass that can infiltrate a bluegrass lawn and cause unsightly clusters of turfgrass. Tall fescue is a cool-season grass that is well adapted to sunny or partially shady areas. It tolerates warm summer temperatures and stays green during cool, but not severe winter conditions. With its coarse-textured medium to dark-green grass tall fescue has excellent tolerance for heat stress and drought, which is one reason that it will grow faster than the bluegrass in the same lawn. Its quick growth, inability to blend with bluegrass and unsightly leaf composition are reasons for tall fescue being on the list of undesirable grass. Like Quackgrass, tall fescue is a grass, and only non-selective herbicides can chemically control them.
Black Medic—is normally a summer annual, but can act as a perennial in some conditions. It has a taproot, spreads low to the ground and is more active on soils low in nitrogen fertility. The leaf is similar to clover and other legumes, having three leaflets. Black medic will produce viable seed under normal mowing conditions. Often multiple applications of weed control are required to effectively control this weed.