Answer: Epsom salts provide magnesium and sulfur, both of which contribute to plant growth. Perhaps more importantly, both can contribute to the pH of the soil and so have a positive effect on the absorption of other nutrients. Yes, both magnesium and sulfur are usually in the soil, but intensive gardening can deplete them. Like most home remedies, this one has plenty of fans because it works for them, and there is some research such as that done by the National Gardening Association that shows positive results. Sprinkle it lightly at the base of the tree in the spring. Best wishes with your crape myrtle!
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