Mold is a part of our natural environment and is not always hazardous. Outside of the home, mold works in harmony with nature by assisting in the decomposing of dead natural matter such as dead trees and leaves. However, inside the home mold growth is undesirable. Mold reproduces by way of very small spores. These spores are too small to be detected by the naked eye as they drift through the air. Mold may start to grow inside the home or structure whenever mold spores come in contact with moist surfaces. There are numerous varieties of mold, all of which require moisture to grow.