Ripe's 1-5-4 NPK is designed to promote ripening in your fruit and flowering plants. Ripe keeps your plants looking lush and green while providing more of the elements needed to help ripen and enhance your yield. This product works by depleting the nitrogen to a minimum level while leaving the phosphorous and potassium at optimal ranges to encourage a plant to focus its energy on its reproductive function - ripening its fruit faster while still maintaining its foliage.