Algae growth on north-facing seating is a common issue due to limited sunlight and higher moisture retention. To combat this, regular cleaning with a mixture of water and vinegar or mild detergent can help remove existing algae and prevent its return. Applying a protective sealant or algae-resistant coating to the seating surface creates a barrier against moisture and spores. Additionally, improving airflow around the seating area by trimming nearby vegetation or using fans can reduce dampness. For long-term prevention, consider using materials like treated wood, metal, or synthetic wicker, which are less prone to algae growth. Finally, covering the seating when not in use or relocating it to a sunnier spot, if possible, can significantly minimize algae buildup. These simple yet effective strategies will keep your north-facing seating clean and algae-free.