EUROPEAN FROG-BIT
European Frog-bit (Hydrocharis morsus-ranae, or EFB) was first identified in Cobbosseecontee Lake in 2018. It has since been detected moving down Cobbosseecontee Stream and was found in Annabessacook Lake in 2025. The plant itself is free floating and grows best in slow-moving water, such as coves and marshes. In the summer, EFB produces small seed structures called turions that drop to the bottom of the lake to lay dormant until spring, when it will grow a new plant.
EFB sends out runners which produce new connected plants that tangle together into a dense web that is impossible to boat or swim through. Management of this plant currently relies on manual removal by both WF staff and volunteers.
