Roundup® for Northern LawnsRoundup for Northern Lawns is a tough weed killer for use on Northern grasses that kills weeds, not the lawn! This tough weed killer kills 253 types of weeds and works fast on hard to kill weeds (see inside booklet for weed list). It won't harm lawns when used as directed on Northern grasses, including Bluegrass, Fescue, Zoysia, Perennial Ryegrass. This product starts working immediately, is rainproof in as little as 3 hours, and controls weeds for up