Epsom Salts have many uses but we never imagined they had a use in the garden! You can use Epsom salts to fertilize and feed roses, tomatoes, and peppers. Epsom Salts contain magnesium which helps strengthen plant cell walls, thereby allowing the plant to take in the nutrients it needs. Epsom Salts also aids in seed germination, photosynthesis and in the formation of fruits and seeds. Either mix in 1 T. of Epsom salt 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.