The best time to weed spray your lawn depends on the type of herbicide you will use. Pre-emergence herbicides control germinating seeds, and you should spray two or three weeks before weeds have germinated. Post-emergence herbicides control weeds that have already grown in. You should spray these when weed plants are young.
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Kelli Bingham is a freelance writer with nearly a decade of experience in the field. Her works have been published in publications including eHow. She is currently pursuing a degree in business.