Dear Friends,
Saturday I spent an exceptional morning filming an ongoing project to save Horn Pond. As many of my readers know, I am making a documentary centered around ponds. One of the most interesting and beautiful of my pond locations is Horn Pond in Woburn. Approximately 110 acres, surrounded by roughly 500 acres of protected conservation and recreation area, Horn Pond is a wonderfully popular place where visitors love to fish, stroll, ride bikes, photograph, and walk the several miles of trails. The Pond is also vitally important to wildlife. Alongside Horn Pond are the Woburn Community Gardens, where the gardens too support a host of wild creatures.
Very unfortunately, as is happening at a number of ponds, lakes, and rivers across Massachusetts, the Water Chestnut infestation has grown exponentially. The invasive, non-native European Water Chestnut (Trapa natans) was first introduced to the US at Harvard University’s Asa Gray Botanical Garden in Cambridge around 1877. In only two years, it had escaped cultivation and was found growing in the Charles River.T. natans now thrives throughout the Northeast.
The non-profit group Friends of Horn Pond have partnered with the Woburn Conservation Commission, Earthwise Aware, and the Mystic River Watershed Association to hand remove the plants from the pond as part of a five year program. The lagoon area of the pond is approximately 14 acres and of that 14, five and half acres are currently smothered in suffocating mats of floating Water Chestnuts. Year one was completed on June 28, 2025, when over 100 volunteers hand pulled more than 15,000 pounds of invasive water chestnut plants. Year two began on June 24-27, 2026, when over 150 volunteers hand pulled more than 46,000 pounds of invasive water chestnut plants. On July 18, 50 volunteers hand pulled 21,000 pounds of plants in 2.5 hours. Saturday, the 25th, the day I was filming, there were over 90 volunteers working two hour shifts throughout the day. Volunteers of all ages joined the scientists and organizers. I didn’t stay the entire day and will try to get the final tally. The work is incredibly challenging, difficult, and dirty but that was not at all daunting to the enthusiastic volunteers.
Dense mat of Water Chestnuts
What will happen to Horn Pond if the Water Chestnuts are not removed? “The plants have no natural predators. Left unchecked, the plants will consume the entire water body, deoxygenate the water, kill the fish including River Herring, before turning it into a marsh.” The lagoon at Horn Pond is an important breeding area for River Herring. A new fish passage is being built at Scalley Dam, which will potentially give the River Herring renewed access to 100 plus acres of spawning habitat.
Friends of Horn Pond was founded in 2022 by Jim Joyce, Patty Sears-Joyce, and Jeanne Bohan, and the Friends are doing incredible work to conserve Horn Pond. While at the event, I was able to speak briefly with Bill Lee, a very active member of the Friends group, along with co-founder Jim Joyce. Here’s Jim, describing in detail, Water Chestnut morphology (structure of the plant).
Please visit the Friends of Horn Pond website to learn more about the stellar (and very inspiring) programs offered by the Friends including Reel-In and Recycle Program to reduce monofilament fishing line and fishing tackle waste; Protect Wildlife Habitats through debris reduction, habitat restoration, trail maintenance, and invasive species management; and Operation Woburn Wildlife, which is focused on robust rodent prevention methods, environmentally safe controls, and stronger policies targeting the root causes of rodent activity without the use of anticoagulant rodenticides (SGARS/ FGARS) within the city borders.
