A nuisance plant is the kind you do not want in your lake or pond. One such plant, the hydrilla or ‘water-thyme’, has been known to spread astronomically and even cause disease in animal populations.
Hydrilla is a perennial plant that forms dense colonies and can grow to the surface in water over 20 feet deep. Hydrilla branches profusely and after reaching the surface it extends across it forming thick mats. This plant is present in several Georgia lakes. Recent studies have even linked hydrilla to bird deaths in water ecosystems.
It is considered a pest because it grows so rapidly, eliminating native species, and forming surface mats that hinder recreation, navigation, and water intakes.The best way to deal with water thyme is old-fashioned hard work; basically pulling and raking it up when it’s feasible.