Where does mold grow? Mold can grow on any type of surface. Mold growth requires moisture; therefore, it typically grows where there is a source of water or high humidity. It also grows in places with limited light exposure. By ProMatcher Staff Updated: 08/08/2016 Next Question Source: CDC Next Question Find Local Pros Free Actuaries Cost Estimates Related Questions Can humidity cause mold growth? Is mold exposure bad for your health? What is mold abatement? Is it possible to completely eliminate mold from the inside of my home?Top answer: Never Is mold growth exponential? Top answer: Yes, mold growth is exponential.