Creating metal sculptures that resist biological growth, such as mold, algae, or lichen, requires careful planning and execution. The key lies in selecting the right materials, applying protective coatings, and maintaining the artwork properly.

1. Material Selection: Opt for metals with natural resistance to corrosion and biological growth, such as stainless steel, bronze, or corten steel. These materials are less porous and discourage microbial attachment.

2. Anti-Microbial Coatings: Apply specialized coatings like copper-based paints or nano-coatings infused with silver ions. These coatings inhibit the growth of microorganisms while preserving the sculpture's aesthetic appeal.

3. Surface Treatments: Use techniques like powder coating or galvanization to create a smooth, non-porous surface that prevents moisture retention—a primary cause of biological growth.

4. Regular Maintenance: Clean sculptures periodically with mild detergents or anti-microbial solutions. Avoid harsh chemicals that could damage the metal or coatings.

5. Environmental Considerations: Place sculptures in well-ventilated areas with adequate sunlight, as UV rays naturally deter biological growth.

By combining these methods, artists can ensure their metal sculptures remain visually stunning and biologically resistant for years to come.