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Helpful tip from The Garden Geeks: Did you know that Epsom Salt Rocks?? For every foot of a plant's height, sprinkle one teaspoon Epsom Salt evenly around the plant's base for better blossoms and deeper greening. Adding Epsom Salt to any plant food will also enrich the color of any flowering plants and aid in disease resistance. Or mix one tablespoon of Epsom Salt in one gallon of water and spray it on the plant. Epsom Salt is magnesium sulfate, which lowers the pH of the soil and provides magnesium.