Water it and they will grow! Mold is reliant on moisture, so to help prevent mold growth keep moisture levels to a minimum in your home. It is in your best interest to have carpeting that is wet be dried out within 24 hours. You don’t want to let water penetrate behind your walls or neglect those leaky pipes, condensation around the toilet, dishwasher or refrigerator as those can get out of hand.
When in doubt…Trust your nose! Mold can have a musty smell to it, as well as visible spots. Mold can be sneaky and not always be visual to the naked eye.