What should be done after applying post-emergence herbicide to treated areas?

After applying a post-emergence herbicide, it is important to avoid mowing for a certain period, typically at least three days. This waiting period allows the herbicide sufficient time to be absorbed by the target weeds. If mowing occurs too soon, it can interfere with the herbicide's efficacy by physically removing the treated plant material and potentially reducing the amount of herbicide that is absorbed. This ensures that the herbicide has the opportunity to work effectively to control unwanted vegetation.

Watering the area heavily after application can lead to wash-off of the herbicide, reducing its effectiveness and possibly leading to inadequate weed control. Seeding immediately is not advisable, as newly planted seeds may be adversely affected by the residual herbicide in the soil. Fertilizing within 24 hours could also interfere with the action of the herbicide, as plants need time to absorb the herbicide before any nutrient application is done, which could potentially enhance or hinder its effectiveness.