Lemna spp.
USDA, NRCS. 2018. The PLANTS Database (http://plants.usda.gov, 28 March 2018). National Plant Data Team, Greensboro, NC 27401-4901 USA.
What is Duckweed?
Overview
Physical Characteristics
Leaves:
- Clusters of 2-5+
- Round or egg-shaped
- Slightly curving
Flowers:
- 2-3 flowers
Fruit:
- Bladder-like
- Slightly winged
Seeds:
- Smooth with a spongy outer layer
Roots:
- 3-11 nerves
Where Does it Grow?
Duckweed can be found in ponds, lakes and streams.
Is it invasive?
Duckweed can be an aggressive invader of ponds and are often found mixed in with other duckweeds, mosquito fern, and/or watermeal. If colonies cover the surface of the water, then oxygen depletion and fish kills can occur. These plants should be controlled before they cover the entire surface of the pond.
Pros and Cons of Duckweed
Submerged portions of all aquatic plants provide habitats for many micro and macro invertebrates. These invertebrates in turn are used as food by fish and other wildlife species (e.g. amphibians, reptiles, ducks, etc.). After aquatic plants die, their decomposition by bacteria and fungi provides food (called “detritus”) for many aquatic invertebrates.
What Type of Duckweed Do I have?
There are three common types of duckweed in North America. Click on the buttons to learn more about each species.