I've used his Fungi products for years both indoors and out.
One year during a drought I had one of the best vegetable gardens in the area with huge yields of Eggplant, Peppers, Tomatoes, and even Carrots and Beets. The only watering I did was when I planted the garden. The key was using this Pearl Oyster Sawdust Spawn mixed into a layer of wood chips with a leaf mulch on top.
Pearl Oyster Sawdust Spawn - Fungi.com Plus in addition to a great crop of veggies I also got a great crop of mushrooms.