Roots Organics Oregonism XL is a distinctive super-soluble formulation of endo/ectomycorrhizae, beneficial bacteria, and Trichoderma. The species of microorganisms in this product are specifically selected for fruiting and flowering plants with a tolerance to heavy fertilizing. Mycorrhizae colonize the root zone, forming a symbiosis with the plant's roots, massively increasing the size and effective surface area, facilitating greater nutrient uptake, resistance to stress, and increased tolerance to drought. Oregonism XL is incredibly versatile and effective in potting soil and hydroponics.