Preemergence herbicides, PREs, are products applied just prior to seed germination to control weeds. If a labeled product is correctly applied at the right time, weeds will be reduced in landscape beds and lawns.
Labeled products are those where the label states the herbicide can be used on the site it will be applied to, and weeds to be controlled are also listed on the label. Landscape sites would include turfgrass, woody landscape beds such as shrubs, perennial flower beds, or ornamental grasses.
We know where our weeds are growing so be sure the site is listed on the label. It is against pesticide laws to apply a product to a site not on the label. Doing so may result in damage to nontarget plants like turfgrass and ornamentals or to the environment.