Epsom salts, or magnesium sulfate, are a popular home remedy for various gardening needs. But can they be safely used in outdoor plant box soil? The answer is yes—when used correctly. Epsom salts provide essential nutrients like magnesium and sulfur, which promote healthy plant growth, greener leaves, and improved flower production.

To use Epsom salts in your outdoor plant box, dissolve 1 tablespoon in a gallon of water and apply it to the soil every 4-6 weeks. Avoid overuse, as excessive magnesium can disrupt soil balance. Ideal for tomatoes, peppers, and roses, Epsom salts can enhance nutrient absorption and combat magnesium deficiency.

Always test your soil first to determine if supplementation is needed. With proper application, Epsom salts can be a simple, effective way to boost your garden’s vitality.