The answer to 'why is my gutters algae growth' is that algae growth in gutters is a common problem caused by a combination of moisture, debris, and lack of sunlight. Algae thrive in the damp, shaded environment found in many gutters, especially those that are not cleaned regularly.
Symptoms of algae growth in gutters include a slimy, green or black buildup that can clog the drainage system and cause water to back up. This can lead to water damage, mold, and other issues if left untreated. While a certain amount of algae growth is normal, excessive buildup should be addressed to maintain proper gutter function.