Should I mow before or after I apply a pre-emergent herbicide to my lawn?

January 07, 2008 Print Friendly and PDF
For granular pre-emergent herbicides that are thoroughly watered into the soil after application, there is no need to alter your mowing schedule. If you cannot water the herbicide into the soil and there is no rain in the forecast before you need to mow, be certain not to collect the clippings, since you may remove a substantial amount of herbicide.

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This work is supported by the USDA National Institute of Food and Agriculture, New Technologies for Ag Extension project.