What are the best methods for preventing lichen growth on granite outdoor tree boxes?

Lichen growth on granite outdoor tree boxes can be unsightly and damaging over time. To prevent it, follow these effective methods:

1. Regular Cleaning – Use a mixture of water and mild detergent to scrub the granite surface. Avoid harsh chemicals that may damage the stone.

2. Vinegar Solution – A diluted white vinegar spray (1:1 with water) can help kill lichen spores. Rinse thoroughly afterward.

3. Pressure Washing – For stubborn growth, a low-pressure wash can remove lichen without harming the granite.

4. Seal the Granite – Apply a high-quality stone sealer to create a protective barrier against moisture and organic growth.

5. Improve Drainage – Ensure proper drainage around the tree box to reduce dampness, which encourages lichen.

6. Sunlight Exposure – Trim nearby foliage to allow more sunlight, as lichen thrives in shaded, humid areas.

By following these steps, you can keep your granite tree boxes clean and lichen-free for years. Regular maintenance is key to preserving their appearance and durability.