Scotts Spot Weed Control for Lawns kills weeds down to the root and leaves the lawn unharmed. This weed killer spray controls listed broadleaf and grassy weeds in the lawn, including dandelions, clover, crabgrass, foxtail, and oxalis. In addition, the lawn care treatment is rainproof in 1 hour. Spray when weeds are actively growing and daytime temperatures are above 45 Deg. F and below 90 Deg. F. It can be applied to Bermudagrass, Buffalograss, Fescue, Kentucky Bluegrass, Perennial Ryegrass, and Zoysiagrass without harming lawn grasses (temporary discoloration may occur on Bermudagrass). Simply turn sprayer nozzle to open, adjust nozzle as desired, and aim at the center of weed and spray to lightly cover. For best results, if turf is drought stressed, water lawn and spray weeds 3 days later when the weeds are not drought stressed.