Down To Earth Soluble Root Zone is a powerful combination of beneficial soil organisms that colonize plant roots and expand into the surrounding soil to greatly increase the absorptive surface area of root systems. Our new ultra-concentrated, professional-grade formula of mycorrhizal fungi, Trichoderma, and a diverse mix of bacterial species work symbiotically to promote increased rhizosphere activity, improved soil structure, and extensive root growth. Soluble Root Zone is ideal for inoculating all types of plants and establishing biological diversity in garden soils, potting mixes, and soilless media.