Microbes Grow Stage Grow Stage MICROBES are a specific group of Beneficial Bacteria and Fungi formulated specially for the Grow / Vegetative Stage of plants. This variety of Microbes is designed to promote Root Growth & Nutrient Availability during the Grow Stage. Inoculate seedlings and established vegetative plants with the highest CFU’s on the market! All RAW Microbes are Double Tested, both the individual culture/species as well as the Final Blend. We test twice to ensure accuracy and viability!