Grow plants with healthy foliage in your garden with this rapid acting, liquid trace element. The Yates Leaf Greener Copper Chelate treats copper deficiency in citrus plants, vines and vegetable crops, and tends to be more common in plants that are grown in sandy and acidic soils. * Apply it directly to deficient leaves for rapid results. * Direct application lowers copper addition to soil, wastage and the risk of soil toxicity.