Rainbow Mix Pro Grow pushes the boundaries of what is possible in a powder/granular plant nutrient. A powerful blend of all natural ingredients and 29 different strains of mycorrhizae & beneficial microbes designed for today's demanding 'High Performance Gardening'. Use as a pre-mix, top/side broadcast fertilizer, soil booster and plant tea. General use rates: 1-4 Tbsp per gallon or 1/4-1 cup per cubic foot of soil. General frequencies of use: Every 12 weeks throughout the growing season.