Answer: There have been many studies about the use of epsom salts but none of the research says with certainty that the use is beneficial to plants. However, gardeners who use epsom salts for their plants swear by it. You might want to run your own trials.
Either mix in 1 T. of Epsom salts into the soil at the bottom of the planting hole when setting out transplants or mix the 1 T. in a gallon of water and water the seedling.
Follow-up with a foliar spray of 1T. per gallon of water when the plants start to flower and again when the young fruits start to form. Try it on a few plants and see if you can tell the difference as the season goes along.
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