Barricade 4FL herbicide is the perfect pre-emergent to prevent season long weeds with just one application. Barricade 4FL prevents the growth and development of newly germinated weeds. In order for the product to work, Barricade 4FL applications should be made prior to germination of the targeted weeds; it will not kill or prevent weeds after they have already began to develop. For control of the following weeds, an application should be made as early as January, or before weeds begin to germinate: Crabgrass Foxtails Goosegrass Barnyardgrass For control of the following broadleaf weeds, an application should be made in the summer/fall before weeds begin to germinate: Henbit Chickweed Other winter broadleaf weeds Poa Annua (Annual Bluegrass) - must apply in late summer to turf that is to not be over seeded before Annual Bluegrass germinates KEY FEATURES/BENEFITS Ability to control the length of Barricade 4FL residual with rate of application Labeled for use with many turf types and controlled species of weeds (over 30 labeled weeds) Labeled for use on ornamentals, golf courses, and residential turf NOT FR SALE IN WA