What is the correct application method for pre-emergent herbicides?

The correct application method for pre-emergent herbicides involves applying them before weeds emerge from the soil. This proactive approach is essential for preventing weed seeds from germinating and establishing themselves in the lawn or garden. By targeting the weed seeds during their pre-emergent stage, these herbicides can create a barrier in the soil that inhibits their growth.

Applying pre-emergent herbicides at the right time, typically when soil temperatures reach a certain threshold for specific weed types, enables effective prevention of weeds before they pose a threat. This timing is crucial because once weeds have emerged, pre-emergent herbicides will not be effective against them.

While mixing pre-emergent with soil can enhance their effectiveness through better activation and movement into the root zone, this is not the primary application method. Moreover, applying herbicides on emerged weeds or limiting their use to fall would not contribute to their intended function, as the goal is to prevent weed establishment during the early stages of germination.