Delay seeding a bare spot caused by the removal of weeds for 3 to 4 weeks and after a good soaking rain or irrigation. Delay applying a broadleaf herbicide to newly sodded areas for 4 to 6 weeks. Delay mowing the treated area for at least 3 days after the treatment. The summer annual weeds germinate and mature in a very short period of time. In addition, the summer annual weeds germinate over a period of several weeks to several months.
Weed control becomes much more complicated with the multiple germination periods.
Most summer weeds develop a thick, waxy leaf tissue to slow water loss from the plant. This makes it more difficult to get a broadleaf herbicide inside the weed as it matures. Consider non-pesticidal approaches during summer months. Mow sparingly during hot dry weather. Reestablish thin portions of the lawn with desirable turfgrass in the fall.