11 Secret Ingredients That Can Help Your Garden Grow
10 Secret Kitchen Ingredients That Can Help Your Garden Grow | Family Handyman. Turn pink hydrangeas blue with vinegar Unlike baking soda, distilled white vinegar is acidic, and acidic soil is the secret to turning your pink hydrangeas blue. (Note: This doesn’t work on white hydrangeas.) Vinegar also enhances the soil of acid-loving plants like azaleas, rhododendrons and gardenias. Use a cup of white distilled vinegar to a gallon of tap water.