Monterey Crab-E-Rad Plus is a post-emergent herbicide that controls crabgrass, dandelion, clover, henbit, plantains, wild onion, and over 100 different broadleaf weeds. It should be applied after the weeds are present and can be used in most cool and warm season grasses. Not labeled for use on centipede and St Augustine turf. Check label for other use restrictions. It is rainproof in hours and won’t wash away.