Barricade 4FL is a pre-emergence herbicide that offers low-rate, season-long control of more than 30 grassy and broadleaf weeds, including crabgrass, goosegrass, and Poa annua. Barricade offers the widest possible window for keeping turf weed-free, allowing for applications as early as January - and a single application lasts an entire season. Plus, Barricade herbicide won't stain fences or other landscape features.