Roots Organics Oregonism XL Endo/Ecto-Mycorrhizae, 3 lb.A distinctive super soluble formulation of endo ecto mycorrhizae, beneficial bacteria, and Trichoderma. The species of microorganisms in our 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 disease, and