Epsom salt has been used in the garden for decades by serious gardeners as a “secret weapon.”
Epsom salt helps produce tasty tomatoes, beautiful roses with gorgeous blooms, bumper crops of peppers, deep green leaves and more. There are many reasons to include Epsom salt (magnesium sulfate) in your garden.
Applying Epsom Salt – Basics
Here are the basic methods and general rates for applying Epsom salt to plants and soil. NOTE: It is always advisable to have a soil test done before applying any nutrients to soil.
Soil Incorporation – Broadcast 1 cup per 100 square feet, mix well into before planting.
At Planting Time – When planting seedlings or new plants, dig a hole and place about 1 tablespoon of Epsom salt in the bottom of hole and cover with a thin layer of dirt, place the plant in the hole and finish planting.
Pre-Planting Soak – Prior to planting, soak root balls in 1/2 cup of Epsom salt diluted in one gallon of water.
Top Dressing – During the growing season, sprinkle about a 1 tablespoon directly around the base of the plant and water it in.
Applying in Liquid Form or Drenching – Drenching plants with Epsom salt improves the overall health of the plant by providing a good dose of magnesium. If your plants are needing a boost, dissolve about one to two tablespoons of Epsom salt in a a gallon of water. Pour at the base of the plant and allow the water-salt solution to soak into the ground. Repeat throughout the season as necessary. source: BestPlants.com