Mold can grow on various materials, such as cardboard, paper, wood, and leather. It can also develop on old food that has been left in the refrigerator for too long, among other things. Mold thrives on organic materials, especially when there is an abundance of nutrients. Once mold spores enter a property, it’s extremely difficult to prevent them from spreading. While it may never be possible to completely eliminate mold, the best approach is to keep it under control. Understanding where mold is most commonly found is a great starting point in the search for potential issues.