Was first discovered in Minnesota in the early 1900's. It was probably introduced to the state when common carp were intentionally brought to Minnesota. It has been here so long that most people do not realize that it is not a native species.
In the spring, curly-leaf pondweed can form dense mats that may interfere with boating and recreation on lakes. It can cause ecological problems because it can displace native aquatic plants. In mid-summer, 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 phosphorous.
Location: Grows from the shore to depths of up to 15 feet.
Description: Leaves are somewhat stiff and crinkled, approximately 1/2-inch wide and 2 to 3 inches long; leaves are arranged alternately around the stem, and become more dense toward the end of branches; produces winter buds can be confused with claspingleaf pondweed.
|Hints to identify: Has small "teeth" visible along edge of leaf; begins growing in early spring before most other pondweeds; dies back during midsummer; the flower stalks, when present, stick up above the water surface in June; appears reddish-brown in the water, but is actually green when pulled out of the water and examined closely. Easily confused with claspingleaf pondweed, which has leaves with no "teeth" around their edges.
The Pelican River Watershed District removes excessive curly-leaf pondweed through harvesting, allowing minimal interruptions in recreational activities on area infested lakes.