Superthrive Vitamin Solution is not a fertilizer, it's a vitamin-based formula. Just as the human body needs a full range of nutrients and suffer from an inferior diet, plants need more to thrive that the nitrogen, potassium & potash found in most fertilizer products. Dr Thompson's proprietary plant health-promoting vitamin formula contains Kelp and Vitamin B, producing larger Blooms and Excellent growth for better results. Just add a few drop of Superthrive to a gallon of water to see excellent results.