SubCulture-M is a Mycorrhizal Root Inoculant and contains a wide diversity of endo and ecto Mycorrhizal fungi that colonize plant roots. These beneficial fungi form a fine network of fibrous strands that serve as an extension of the plants root system; increasing root area and helping plants absorb water and nutrients. With SubCulture-M you can reduce the amount of fertilizer needed while achieving superior growth and huge yields. Use SubCulture-M from germination or propagation all the way through harvest.