Don’t wait for the mold to take over! Mold grows rapidly in a moist environment. You’ll never find mold on a dry surface. Without moisture, mold will not grow. Mold can feed on both organic surfaces, such as wood, paper, and drywall, as well as on non-organic materials like paste and paint. Mold is not able to feed on things like concrete, metal, or glass. However, mold is found on these surfaces because it can feed on any dust or organic residue that is left on the surfaces.