Simazine 4L is a preemergence herbicide that provides effective broad-spectrum control of a wide range of annual and perennial grasses and broadleaf weeds in a variety of crops. This formulation contains 41.9% Simazine which is effective in controlling troublesome weeds such as barnyardgrass, chickweed, carpetweed, crabgrass, lambsquarters, downy brome, fall panicum, filaree, fireweed, foxtail species, goosegrass, henbit, ragweed, wild oats, witchgrass, and more. Generally, it is applied before emergence of weeds or following weed growth removal. Rainfall or irrigation is required to help penetrate it into the root zone. This liquid formulation may tank-mixed with other herbicides for enhanced efficacy and performance. Available in a 2.5-gallon jug.