How do I use vinegar in my garden?

How do I use vinegar in my garden? Increase Soil Acidity
Combine one cup of plain white vinegar with a gallon of water and use the next time you water these plants to see some amazing results. You can also add some distilled vinegar to your soil to fight lime or hard water for other not-so-acid-loving plants.

Can you spray white vinegar on plants? It will probably come as no surprise to you that vinegar is extremely acidic. Luckily, there are lots of plants, including hydrangeas, rhododendron, gardenias, hollies, and azaleas that love being grown in acidic soil. Just spray them with a mixture of a gallon of water and a cup of white vinegar.