My pond is covered with green slime or stringy “moss.” What is it?
Look closely at the plant material. If the water is tinted green, green-blue or possibly even brownish, then your pond is probably experiencing a planktonic (free floating, microscopic) algae bloom. These blooms usually consume available nutrients and run their course. A foul odor sometimes accompanies the bloom. If the plants do not contain leaves and are stringy filaments, clumps or netlike masses, then one or a number of the species of filamentous algae are present. Filamentous algae usually start growing on the bottom, form mats that can float to the surface, and can eventually cover the entire surface of the pond.
