European frog-bit(Hydrocharis morsus-ranae) is a free-floating annual. The leaves are leathery and round with undersides that may be dark purple. White flowers with yellow centers bloom in the summer. The veins follow the heart-shape of the leaf. The leaf stem of European frog-bit lacks a midline groove which distinguishes it from its native look-alike American frog-bit, Limnobium spongia.
Confirmed observations of European frog-bit submitted to the NYS Invasive Species Database. For more information, visit iMapInvasives
This plant grows well in quiet, open water including marshes, ditches, swamps, and sheltered coves.
Threats & Impacts:
European frog-bit has rapid vegetative spread and forms dense mats, which can limit light penetration and inhibit recreational use.
Limited information exists about control techniques for this species. Hand pulling may be suitable to control individual plants or small infestations.