Quackgrass (Elytrigia repens (L.) Nevski) is an invasive weed - not normally considered to be a desirable cover crop. However, its nutritional value makes this weed more tolerable in alfalfa (Medicago sativa L.) than in corn (Zea mays L.). Growers typically attempt to eradicate quackgrass from corn fields, but manage this weed less aggressively in alfalfa, where it contributes to hay quality and yield.