Supercharge your plants' roots growth using Roots Organics Oregonism XL. This distinctive super-soluble formulation of endo/ecto-mycorrhizae, beneficial bacteria and Trichoderma will help increase the size and surface area of roots. More specifically, Mycorrhizae will colonize the root zone, forming a symbiosis with the plant's roots. This increases the root's capacity for nutrient uptake, resistance to disease and increased tolerance to drought. Size: 1.8 oz. Additional Sizes Available.