Hello all. I am in need of your expertise. I have a old wood shed on my property, that I am planning to grow in. Well, I've been cleaning it out and have discovered alot of rotten pieces wood with mold on it. And I have found some of the walls have a little dark colored mold on them also. Is there anything to be alarmed about? I am in N.Ca Tehama County where we have very hot Summers and wet Winters.