Use paints with mold inhibitors. A low watt light bulb, left on all the time can help reduce mold growth in closets. Damp shoes and boots stored in a closet are also sources of mold. Limit the number of house plants. Moving plants, especially the leaves, can release spores.
Mold can also grow in the plant bark.
Modern tightly insulated houses prevent the escape of moisture and increase mold growth. Prune and cut trees to increase the sun exposure. Molds spread on windy dry days and in rainfall. Soil, compost piles, hay, and fertilizers are sources of mold. Wear a face mask if you cannot avoid mold exposure.