What are the best methods to prevent algae on granite flower boxes?

Granite flower boxes add elegance to any garden, but algae growth can mar their beauty. To prevent algae, start by ensuring proper drainage to avoid standing water, a primary cause of algae. Regularly clean the granite with a mixture of water and white vinegar or a mild bleach solution to kill spores. Applying a sealant designed for natural stone can create a protective barrier. Positioning the boxes in areas with good sunlight and airflow also helps reduce moisture buildup. For long-term prevention, consider using algae-resistant plants or copper strips, which naturally inhibit algae growth. These simple steps will keep your granite flower boxes looking pristine year-round.