You can collect duckweeds yourself, or
you can find them for sale in small quantities from aquatic plant dealers and biological stock centers. Since duckweeds
grow rapidly, these small quantities are suitable sources for
experiments and class demonstrations. Except for the
biological stock centers, these cultures are not axenic (sterile).
Your local pond or wetland.
Collecting duckweeds in the wild is easy. Bring small cups or bottles and collect at least enough pond water to float the collected plants, more if you want to maintain their growth. A small net is useful for collecting the plants. Identifying the correct genus is not difficult, although species identification requires more experience. For most student work, species identification is unnecessary.
|Right: Video, Watch Tamra Fakhoorian explain how to collect duckweed from the wild and culture it. She has more tips and information on her website, www.DuckweedGardening.com.||
Aquatic plant dealers and
biological supply houses.
A few suppliers offer specific cultures. For example:
Van Ness Water Gardens in Upland, California has Lemna minor. Another California company, PondPlants.com offers cultures of several species, including Lemna minor, the Ivy-leafed Duckweed (Lemna trisulca) and several blends, which can include the smallest duckweed, Wolffia arrhiza.
Tropical Pond and Garden, Loxahatchee, Florida, offers cultures of Lemna minor.
Duckweeds (not identified by species) are available from several
Anchor Bay Aquarium in Michigan advertises live duckweed for sale by the ounce or by the pound. Carolina Biological Supply, cat. no. WW-16-1820, 100 to 150 plants/unit. Berkshire Biological, product code BBDW02, 2 ounces per unit.
Duckweed Living Stock Centers.
Germplasm Collection: Rutgers Duckweed Stock
Cooperative at Rutgers University has obtained the
world-wide duckweed collection assembled by the late
Prof. Elias Landolt of the ETH, Zurich, Switzerland.
Prof. Landolt spent his academic career collecting and
studying the Lemnaceae. This collection was
previously held at North Carolina State University and
the Biolex Company, Pittsboro, NC.
The Landolt collection has been augmented by many strains collected by Dr. Todd Michael of Rutgers, and Prof. Klaus Appenroth of the the Friedrich-Schiller-Universitšt, Jena, Germany. As of September, 2011, the Cooperative had over 600 different strains, collected from all continents except Antarctica, and it continues to add to its collection. To request living plants from this collection, see instructions at the Rutgers Duckweed Stock Cooperative website.
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Revised: August 27, 2013