Roots Roots Organics Oregonism XL is a distinctive super-soluble formulation of endo/ecto-mycorrhizal fungi and beneficial bacteria. 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. The beneficial bacteria in this unique product also increase the solubility and availability of plant and root growth promoting nutrients. Oregonism XL is incredibly versatile and effective in potting soil and hydroponics.