When weeds that are actively growing can be seen, such as those with green stems and leafy stalks. These may be in flower or fruit. When weeds have not yet emerged from the soil (such as if they were killed by cold weather), apply when the plants are dormant. This is usually in late summer or fall, but can also occur at other times of year depending on how much weed seed was planted and what season you live in. Follow label directions for best results whenever you decide to use Roundup® Brand Weed & Grass Killer.
How do I apply roundup?