Answer: Epsom salts are used as a source of magnesium and are used as a side-dressing or foliar spray as needed during the growing season. Certain crops, including peppers, tomatoes and roses, sometimes benefit from the additional magnesium. As long as your parsley is growing well and soil tests have not indicated a lack of magnesium, it's probably not necessary. You could certainly experiment and see if you get better results. An all-purpose dilution rate is one Tablespoon of epsom salts to a gallon of water; this can be used as a foliar spray or as a soil drench.
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