actually use the vinegar to keep insects off of houseplants, but not directly on the houseplants. Also, you didn't specify what kind of vinegar you used, there's the bad wine type (when you are making wine, and some turns to vinegar), white vinegar, or cider vinegar. The primary difference being the % of acetic acid.
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Vicious Vinegar and Your Houseplants
White vinegar has a strong, unpleasant odor and taste that can effectively repel cats from areas of your home that you don't want them to go near, recommends the Alley Cat Allies website. While vinegar is nontoxic to cats and humans, it is harmful to plants because it contains 5 percent acetic acid. If you spray vinegar on the leaves of your houseplants, it will destroy their cell membranes, warns the Northwest Center for Alternatives to Pesticides. This destroys the leaves, and if the vinegar gets down into the soil of the plant, it will dry out the roots and kill the plant.
You Can Still Use Vinegar
While you can't spray it directly on your houseplants, you can soak some towels in white vinegar and wrap them around your plants' containers to keep your kitty away from them. Prevent Fluffy from sitting or digging in your houseplants by laying some aluminum foil on top of the soil of each plant. Place vinegar-soaked cotton balls on top of the foil to further deter. Another option is to spray a few silk plants with vinegar and place them among your real houseplants.
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