Dozens of New Hampshire lakes are at war with invasive plants. For most, it’s a losing battle.

Every week all summer long, a surveillance boat and diver make the rounds on New Hampshire’s Suncook Lake in Belknap County. Kayakers and paddleboarders help, too, heading out in the early morning when the surface is calm to peer into the depths. They’re tracking the progress of an invader the Suncook Lake Association has fought, […]