Jonathan Green Touch-Up Tri-Rye Perennial Ryegrass is a 100% premium perennial ryegrass blend. The three perennial ryegrasses in this mixture are all dark-green in color and fast to germinate so they fill in bare spots and thicken the lawn quickly. This mixture has been used on golf courses to overseed fairways, tees and roughs for years. This product is also used in the fall to overseed warm-season grasses such as bermudagrass which goes dormant and turns brown when the weather turns cold. Touch Up provides a green carpet during the winter months and recedes when the warm season grasses start growing again during spring. Touch Up is very tolerant of heavy traffic situations and contains beneficial endophytes making the lawn naturally insect resistant.