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Giant duckweeds have two or more roots per frond, unlike other duckweeds.
Small fish at very high stocking rates (see filamentous algae above) may give control; larger fish at normal stocking rates usually are not effective.
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Giant duckweed grows in swamps, ponds and bogs. It can completely cover the surface of the water and clog irrigation pumps and sprinklers. It also can be found growing with other duckweed and Azolla species.
Measure 1/8th to 1/4th of an in. in diameter and are dark green. The upper surface of each leaf may have a purple dot, or slightly purple edges. The underside of each leaf may also be tinged purple. Each leaf is rounded with a slightly pointed end.
Other duckweeds have one root per frond, and watermeal does not have visible roots.
Whether you're a professional botanist or a casual nature enthusiast, the NC State University (NCSU) Aquatic Weeds app has detailed information on a wide variety of aquatic weeds to assist in identification.
Please read these instructions before downloading the software:
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