Why is curly-leaf pondweed a problem? In spring, curly-leaf pondweed can form dense mats that may interfere with boating and other recreation on lakes. Curly-leaf also can cause ecological problems because it can displace native aquatic plants. In midsummer, curly-leaf plants usually die back, which results in rafts of dying plants piling up on shorelines, and often is followed by an increase in phosphorus, a nutrient, and undesirable algal blooms.
Information courtesy of The Invasive Species Program, Division of Ecological Services Minnesota Department of Natural Resources
Photos courtesy of Valerie Dillion