![]() Its important to note that both the fertilizer and pre-emergent herbicide in weed and feed are intended to linger in the soil for several weeks. Do not overwaterthis can wash your weed killer and turf builder out of the soil.Pre-emergent herbicides need to be watered in to work effectively, so a good watering or rainfall 24 hours after application is helpful.Wait 1224 hours after applying a crabgrass preventer weed and feed before you water.So, watering your lawn as few as 12 hours after application typically isnt a problem. Pre-emergent herbicide needs to be watered into the ground in order to form a chemical barrier that kills seeds as they sprout. However, weed and feed with pre-emergent herbicides are more forgiving than products with post-emergents. ![]() Its best to wait 24 hours before watering a lawn where youve applied weed and feed with pre-emergent crabgrass preventer. ![]() When Should You Water After Applying Weed & Feed With Pre
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