Roots Organics Oregonism XL is a distinctive super-soluble formulation of endo/ectomycorrhizal fungi and beneficial bacteria. The species of microorganisms are specifically selected for fruiting and flowering plants with a tolerance to heavy fertilizing. Mycorrhizae colonize the root zone, forming a symbiosis with the plantâ€™s roots, massively increasing the size and effective surface area, facilitating greater nutrient uptake, resistance to abiotic stress, and increased tolerance to drought. The beneficial bacteria in this unique inoculant increase the solubility and availability of plant and root growth promoting nutrients. Oregonism XL is incredibly versatile and effective in potting soil and hydroponics."