Answer: Epsom salts is a source of magnesium, which is one of the 16 nutrients that all plants require. Magnesium is required in small amounts (it is a micronutrient) and most soils have sufficient magnesium. However, peppers do seem to thrive with some extra magnesium, so if you want to add some, mix 1 tablespoon of epsom salts with one gallon of water. Spray the foliage with the mix when the plant flowers, or water the plant with it.
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