Xtreme Gardening® Mykos® 20lbMYKOS mycorrhizae is a natural and organic species of beneficial soil fungi that create a "sponge like" mass which collects and stores nutrients and water, increasing the uptake of both. This single species of arbuscular mycorrhizal fungi contains only Rhizophagus intraradices, formally known as Glomus intraradices. MYKOS does not contain any other microbes such as trichoderma or ectomycorrhizae.