Invasive zebra mussels have been found in “moss balls,”plant product sold at aquarium and pet supply stores, garden centers, florist shops, and online retailers. Zebra mussels are regarded as one of the most destructive invasive species in North America.
Zebra mussels can quickly take over once they get established in a waterbody and cause significant damage including disrupting the food chain, changing the chemistry of the water (which can cause more blue green algae outbreaks or offensive taste), and clogging water intake and delivery systems. The concern is that live mussels released into a storm drain or flushed could be introduced into a waterway.
A moss ball is a species of green algae that is formed into a ball and is 2 to 5 inches in diameter. Moss balls are used in home aquariums, terrariums, and water gardens.