Epsom Salts provide a rapid cure for magnesium deficiency in plants.Magnesium is vital for the production of chlorophyll, without which plant foliage will turn brown and wither. An early symptom of the problem is a yellowing between the veins on older leaves. Tomatoes and house plants can be particularly susceptible to this deficiency.Vitax Epsom Salts provide a simple and very effective remedy. Apply as soon as the problem is spotted. Either work into the soil as a base dressing or dissolve the salts in water and apply directly to the leaves with a sprayer or watering can.