Hydrangeas & Coffee Grounds – Adding coffee grounds or other organic material to your hydrangea’s soil will reduce the pH level and make aluminum more available to the plant. The result will be hydrangeas that are blue in color.
I love vinegar! Rid your garden of aphids by spraying your plants with a solution of vinegar and water. 1 cup vinegar to a gallon of water. Vinegar is a natural pesticide so you can get rid of many critters by using a solution mixed with water.