Roots Organics Oregonism XL is a distinctive super-soluble formulation of endo- and ectomycorrhizae, beneficial bacteria and trichoderma. 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 plants roots, massively increasing the size and effective surface area, facilitating greater nutrient uptake, resistance to disease and increased tolerance to drought. The beneficial bacteria and trichoderma in this unique product also produce plant- and root-growth-promoting compounds and protect against pathogens. Oregonism XL is incredibly versatile and effective in potting soil and hydroponics.