Summer Weed Control

http://extension.missouri.edu/

Weed control in the summer is more difficult than controlling weeds in the spring, because the growth rate during the hot, dry summer is considerably slower. When plants (including weeds) aren't actively growing, they don't intake weed control product as effectively.

Therefore, if you are going to treat weeds in the summer, be patient. It will take a few more applications to get the job done. Violets and nutsedge are particularly difficult to control.

Thankfully, once fall temperatures arrive, most weeds are finishing their life cycles and dying off. You may choose to apply a preemergent in the fall to prevent annual, grassy weeds (crabgrass) the next growing season. It is also acceptable to apply preemergent in the spring, before soil temperatures hit 55 degrees F.