- Horticultural vinegar is 20 to 28 percent acetic acid and is considered a very effective organic weed control. It is a complete plant killer when used by itself or in combination with a yucca extract or lemon. It is damaging to plants due to its low pH of 3.2. Regular household vinegar does not contain as many additives and only has 5 to 7 percent acetic acid. Since the pH of horticultural vinegar is so low, it is advised to irrigate the treated area well after the weeds are dead. When applying it to creeping Charlie or any other weed, use a plastic squirt bottle and apply to the crown of the weed in a straight stream. Though it is not a registered pesticide in the U.S., horticultural vinegar is a registered pesticide in Canada.
- Borax is also considered very effective for controlling the spread of creeping Charlie. Dissolve 10 oz. borax in 4 oz. warm water. Mix solution with 2 ½ gallons of warm water. This makes enough to spray at least 1,000 square feet. This spray should be used once a year. If left uncontrolled, creeping Charlie can cover entire lawns thickly and can drain all nutrients. The weed grows well in damp areas and thrives in damp soil. It can grow with equal vigor in sunny and shady spots.
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