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The two most common forms of algae that ponds experience are planktonic algae and filamentous algae. Planktonic algae is the type that gives pond that distinctive pea green, soupy color. Planktonic algae in moderation is very important as is the base of the food chain in a pond. However, it is when it is in excess that you get the green water.

Filamentous algae is what you typically see growing on rocks and floating on the surface in mats. It is the stringy, hairlike algae that you often see in the spring and summer months. It has little redeeming value.

Algae in moderation is good for a pond, but when it becomes over abundant, it can cause severe water quality problems. (Read the full post about ‘What Causes Pond Algae and How to Control it’…)