Micro Maxx is a unique blend of compost and microbes with humic and fulvic acids. Micro Maxx Complete Starter mix is a unique blend of 100% vegetative compost combined with a microbial rich source of granular humic acid, L-amino acids and a vitamin to give you superior plant performance. Humic acid has long been associated with increasing microbial activity in the soils to provide increased root growth, better nutrient uptake and increased plant vigor and health.