Epsom Salts - a trusted cure for plant leaf yellowing, as used by professional gardener's and leading horticulturalists. Granules can be worked into the soil around the base of plants or dissolved in water and applied as foliar feed For trees & shrubs - apply 20g per m² around the base of established plants. Gently fork into the soil surface without disturbing the roots and water in thoroughly. Alternatively, dissolve 35g in 4.5 litres of water and apply directly to foliage with a fine spray. For flowers and vegetables - apply 20g per m² on the soil surface and fork in. Water in well after application. For soil conditioning - apply 20g per m² as a top dressing and work well into the soil. Pack Size: 3Kg Magnesium is important for the production of chlorophyll, which provides the green colour in plants, allowing them to use the sun's energy in photosynthesis. It is also critical for seed germination and fruit production. Magnesium has the added benefit of improving uptake of other important elements such as nitrogen and phosphorus for plant growth. Epsom salts to feed plants that crave magnesium, including tomatoes, peppers, and rose bushes.