Outdoor stone sculptures are vulnerable to biological growth such as algae, moss, and mold due to exposure to moisture and organic debris. To preserve their aesthetic and structural integrity, follow these proven methods:

1. Regular Cleaning – Use a soft brush and mild detergent to remove dirt and organic matter. Avoid harsh chemicals that may damage the stone.

2. Apply Protective Sealants – Penetrating sealants create a barrier against moisture, reducing the likelihood of biological growth. Reapply every few years for optimal protection.

3. Control Surrounding Vegetation – Trim nearby plants and trees to minimize shade and moisture retention, which encourage algae and moss.

4. Use Biocides Sparingly – If biological growth is persistent, apply eco-friendly biocides specifically designed for stone surfaces. Follow manufacturer instructions carefully.

5. Ensure Proper Drainage – Prevent water accumulation around the sculpture by improving soil drainage or adjusting its placement.

By implementing these strategies, you can effectively prevent biological growth and extend the lifespan of your outdoor stone sculptures.