By Tom Spears, Ottawa Citizen, June 15, 2015
European water chestnut grows so thick on the surface of lakes and rivers that
it cuts off the light beneath and, for good measure, sucks up the water’s
oxygen. And now it’s here. The invasive weed was found by Ducks Unlimited in the
Rideau River upstream from Black’s Rapids last summer, the Rideau Valley
Conservation Authority says. The authority sent volunteers to rip it out but
suspects seeds might have survived. via
Invasive water chestnut found in Rideau | Ottawa Citizen.