Yellow Sulphur is an important nutrient which forms a vital component of many amino acids which makes it essential for efficient protein production. Sulphur deficiency shows as a yellowing between the veins and around the margins of the plant’s youngest leaves. This can increase a plants susceptibility to a range of diseases, from powdery mildew to blackspot, particularly on roses. Promotes strong healthy growth on many plants. Can also be used on soils for acid loving plants such as rhododendrons, heathers, azaleas and camellias. Also helps neutralize effects of hard water when plants are grown in planters.