Magnesium sulfate, more commonly known as Epsom salts, is often used by gardeners to correct a magnesium deficiency in soil. According to the University of Maryland, gardeners should not apply magnesium sulfate to soil around tomato plants unless a soil test shows that the soil is lacking magnesium.
About this Author
Amy Deemer began her writing career in 1992. She began writing online content in 2009 and writes primarily for Answerbag and Garden Guides. Deemer enjoys researching and writing about flowers, plants and gardening. Deemer has an Associate of Arts in liberal studies from Westmoreland Community College.