Duckweed | Pond Plant | Lemna minor

Duckweeds tend to grow in dense colonies in quiet water, undisturbed by wave action. Often more than one species of duckweed will be associated together in these colonies.

Although Duckweed is native, it can be aggressive invaders of ponds and are often found mixed in with mosquito fern 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 Common Duckweed

Many kinds of ducks consume duckweed and often transport it to other bodies of water. Duckweed colonies provide habitats for micro invertebrates, but if duckweed completely covers the surface of a pond for an extended period of time, it will cause oxygen depletion. These colonies will also eliminate submerged plants by blocking sunlight penetration.

Leaves:

• 1-3 leaves
• 1/16 to 1/8 inches long
• Light-green
• Nearly flat on both sides
• Flat, oval shape

Fruit:

• Small, bladder-like shape
• Slightly winged

Seeds:

• Long rigid seed or smooth with spongy outer layer

Roots:

• Single root
• Cluster together with other duckweed in groups of 2 to 5+

Where Does it Grow?

Duckweeds tend to grow in dense colonies in quiet water, undisturbed by wave action. Often more than one species of duckweed will be associated together in these colonies.

Is it Invasive?

Although Duckweed is native, it can be aggressive invaders of ponds and are often found mixed in with mosquito fern 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.

Many kinds of ducks consume duckweed and often transport it to other bodies of water. Duckweed colonies provide habitats for micro invertebrates, but if duckweed completely covers the surface of a pond for an extended period of time, it will cause oxygen depletion. These colonies will also eliminate submerged plants by blocking sunlight penetration.

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