You have to use it when it's not expected to rain for 36 hrs or so. Spray in the morning after the dew has evaporated. Walk away.
This Homemade Weed Killer has only 3 ingredients. Spray it on the weeds and they'll die within a few days.
Tree Stump Remover using Epsom Salt and Drilling Holes.
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This Natural weed killer saved my 5 acres AND my health, plus it's cheaper than round up!