Mold only needs a few things to grow and multiply: Nutrients (food), a suitable place to grow, and moisture.It can grow almost anywhere where there is enough moisture or high humidity. Controlling moisture is the key to stopping indoor mold growth because all molds require water to grow.Many building materials (such as wood, sheetrock, etc.) provide nutrients, supporting mold growth. Even dust that has settled on these materials or furniture can be a food source for molds.