Maintain your home by keeping roofs, walls, windows, and plumbing in working order.
How Mold Grows On Walls. Mold and mildew are both types of fungi that thrive in humid conditions with poor ventilation. Why & where mold grows on drywall:
The Growth of Molds: Causes and Spots - Clean Water Partners from cleanwaterpartners.org
They can grow on almost anything if it is moist enough. This page describes how to deal. Mold is a fungus that has various uses.
The most common type of mold found in homes is mildew.
Mold can grow on walls, clothes, books, toys, and even cds. Tiny particles are indoors and out, thriving on moisture and high humidity levels, the very add mold inhibitors to paints. Mold can be identified by appearance and texture and testing for efflorescence. Another indicator of mold growth is discoloration, which can occur even if you have repainted your home's walls.