Rich Hulls are available in areas that grow rice such as over the hill from Humboldt Bay in the Sacramento Valley. Sawdust should work but put down some fertilizer first if you do use it...
Ok... I don’t suppose I could easily (or inexpensively) get rice hulls here in the Middle Tennessee area then.
I guess I’ll stick with wheat straw since I can get pretty clean bales from a local farmer’s supply.
Thanks though...