Scotts Turf Builder Bonus S Southern weed and feed 2 will not only kill weeds, but also thicken your lawn to help crowd out future weeds. Regular feedings provide the nutrients your lawn needs to look its finest and withstand the stresses of heat, drought and family activity. Bonus S may be used on St. Augustine grass (including Floratam), Centipede, Zoysia and Carpet grass lawns. Apply when grass and weeds are actively growing.