Artists employ various strategies to ensure their metal sculptures remain resistant to biological growth like moss or lichen, especially for outdoor installations. One common method is applying protective coatings, such as clear sealants or specialized anti-microbial paints, which create a barrier against moisture and organic matter. The choice of metal also plays a crucial role—stainless steel, bronze, and corten steel naturally resist biological growth due to their composition and patina.

Regular maintenance, including cleaning with mild detergents or pressure washing, helps remove early signs of growth before they take hold. Some artists incorporate design elements like sloped surfaces to prevent water accumulation, a key factor in moss and lichen development. For added protection, UV-resistant coatings or wax treatments can be reapplied periodically.

Innovative approaches include using copper alloys, which release ions that deter organic growth, or embedding sculptures with slight electrical currents to inhibit biological attachment. By combining material science with artistic foresight, sculptors ensure their creations withstand nature's encroachment while maintaining aesthetic integrity.