Frogbit Plant

Photo by Leslie J. Mehrhoff, University of Connecticut,

European frog-bit is a free-floating perennial invasive plant originating in Europe, parts of Asia, and Africa. The plant has small (1.5 to 6.5 cm), rounded,  kidney-shaped or heart-shaped leaves with dark purple, spongy undersides. The plant spreads rapidly creating dense mats. The flowers of this plant are small and white with three petals and a yellow center. European frog-bit harms the environment by crowding out and inhibiting light penetration to submerged native plants. The large dead decomposing mats remove oxygen from the water degrading the aquatic habitat. The dense mats also make boating, swimming, and fishing difficult.

You Can Stop the Spread of Invasive Plants. Always Clean, Drain, and Dry Your Boat, Paddle Gear, and Footwear.

  • Clean all plant stems and fragments and mud from boats and trailers before leaving your lake or river and dispose of them in an aquatic invasive species disposal station if one is available.
  • Empty all water from live well before moving to a new body of water.
  • Dispose of leftover bait in the trash, not in the water.
  • Clean out waders and wading boots before moving to a new body of water.
  • Dry your boat and gear thoroughly between waterbodies by towel drying or drying in the sun for at least 5 days.

Report European frog-bit with can help ADK (Adirondack Mountain Club) survey ponds and lakes for aquatic invasive species such as Yellow Floating Heart and European frog-bit. For more information on the Backcountry Water Monitors Project and upcoming workshops and outings visit

Sources and Field Guide Pages for Download