Epsom Salts provide a rapid cure for magnesium deficiency in plants A rapid cure for magnesium deficiency in plants Tomatoes and house plants can be particularly susceptible to this deficiency 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. The early symptoms 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.