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The acetic acid component of vinegar causes burning of a plant’s cuticle. Since household vinegar is only 5 percent acetic acid, it is not strong enough to kill sturdy, mature weeds. Commercial vinegar-based, food-grade herbicides contain 20 percent acetic acid.Click to see full answer. Accordingly, can you spray vinegar on tomato plants?A combination of apple cider vinegar and water can prevent and treat leaf spots fungi, mildews and scab diseases. Combine 3 tbsp. of cider vinegar with 1 gallon of water. Put the solution into a spray bottle and spray your tomato plants every morning.Subsequently, question is, can I use vinegar to kill weeds in my vegetable garden? Pour 1 gallon of white vinegar into a bucket. Everyday 5-percent household white vinegar is fine for this weed killer. You won’t need higher, more expensive concentrations such as 10 or 20 percent. It may take two or three days longer to kill the weeds with the lower concentration, but they will die. Regarding this, will vinegar kill my plants? Vinegar gets a lot of buzz as a miracle gardening product. Manufacturers claim the product kills weeds, fertilizes the soil and even combats plant diseases. Vinegar is an acid and can cause damage to plants, although it probably won’t kill flowers. Just the same, use it with caution in the garden.Will vinegar kill bugs on tomato plants?Note: It’s not necessary to spray vinegar directly on your plants to deter pests. In fact, this can damage or kill plants, especially if you’re using large amounts of vinegar. If you do use apple cider vinegar on your plants, dilute it generously with water.

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