SUPERthrive® is a kelp enhanced, natural vitamin solution that helps promote plant health from seedling to maturity. Trusted by professional farmers & growers since 1940, SUPERthrive® is now available in a ready-to-use formula for the home gardener. Easy to apply; just spray foliage every 2-3 days. SUPERthrive® helps promote plant health and build plant vigor to use with: seedlings & cuttings outdoor flowers & vegetable plants indoor houseplants & bonsai. To avoid potential leaf burn, apply in the early morning. Covers up to 100 square feet.