Epsom salt, or magnesium sulfate, is used as a fertilizer during the whole gardening season for both tomatoes and peppers. It works well with other fertilizers and treats the magnesium deficiency that both tomatoes and peppers can suffer.
Epsom salt will not build up in the soil, unlike other forms of fertilizer.
Epsom salt treats magnesium deficiency in both peppers and tomatoes. Absorption rate of nitrogen, phosphorus, and potassium is aided by magnesium sulfate.
Epsom salt is used the whole gardening season. It is a garden primer, used to reduce plant stress during the planting process, as a side-dressing, and a natural fertilizer that is applied once a month in a dilute water solution.