Superthrive The Original Vitamin Solution for Plants, 4 oz. a super concentrated, eco-friendly, and non-toxic vitamin and mineral supplement for plant growth from the inside out. It quickly helps plants recover their strength by building a strong root base and reducing transplant shock. Newly added Kelp integrates with the existing nutrition provided by Superthrive since 1940. Use alone or in conjunction with a fertilizer program. Ideal for home gardeners and professionals alike. Superthrive is essential to support healthy landscapes, vegetables, flowers, trees, and indoor plants.