Biological Name:

Wolffia spp. (Watermeal)

Natural Habitat:

Watermeal: This plant is native to North America and typically grows in slow-moving or stagnant water, such as in ponds, marshes, and ditches. It is commonly found in the eastern United States and Canada.


Watermeal is a tiny aquatic plant that is native to North America. It is often found in still or slow-moving water and has small green thread-like leaves. It is considered a nuisance in some areas because of its ability to reproduce rapidly.

Frequently Asked Questions (FAQs)

Q: What will kill watermeal?
A: Two herbicides are labeled for duckweed and watermeal control: diquat and fluridone.

Q: Can watermeal kill fish?
A: Watermeal’s tendency to cover entire surfaces of water also reduces the oxygen levels of the water body resulting in oxygen depletion that can kill fish and other organisms.

Q: How do I get watermeal out of my pond?
A: Fluridone (Rated: Good)Flumioxazin (Rated: Excellent)Penoxsulam (Rated: Good)

Q: Does fluridone kill watermeal?
A: For ponds with an average depth over 5 feet, 1.0 to 1.5 quarts per acre should be applied. Fluridone is nonselective at rates to control watermeal and duckweed, so many other plants may be affected.

Q: What eats duckweed in a pond?
A: Some of the most popular predators that like to eat duckweed are koi, goldfish and grass carp. These predators won’t get rid of a large duckweed problem, but they will help ensure that one does not start (or that a small amount of duckweed does not become larger).

Q: What is the difference between watermeal and duckweed?
A: Description: Tiny, free-floating green plants. Watermeal resembles small grains floating on the water surface; no roots are present. Duckweed typically consists of a leaf or cluster of leaves with small roots that hang down into the water; leaves and stem are not distinguishable from each other.

Q: Does duckweed keep water clean?
A: Yes, those tiny leaves and even tinier root systems are so great at excess nutrient removal that they can leave wastewater significantly cleaner. Some species of duckweed are deliberately cultivated as a natural filter in countries that require a low-cost form of water treatment.

Q: What causes watermeal in pond?
A: Any overabundant plant growth is a symptom of excessive nutrients (phosphorus and nitrogen) in the pond water. These nutrients may come from runoff from barnyards, crop fields, septic systems, lawns, and golf courses.

Q: What kills duckweed without fish?
A: Use Safe Chemicals Another herbicide that can help with controlling duckweed is diquat dibromide. This chemical is often sold as Reward. Finally, another safe chemical for duckweed control is Flumioxazin. This is a fast-acting herbicide, and it is most effective when you apply it to young, actively growing plants.

Q: Is watermeal edible?
A: Edibility: The plant can be eaten as a vegetable. A high-protein food source, it contains approximately 40% protein. In its native region, it is often eaten as a vegetable, having a taste similar to sweet cabbage.

Q: Who eats watermeal?
A: While the watermeal is at least somewhat controlled, you’ll want to introduce pond fish that eat this plant, like koi or grass carp. Koi will eat watermeal readily, while grass carp may eat other plants first. Another option is to add a couple of ducks to the landscape.

Q: Is watermeal good for ponds?
A: Although watermeal is native, it can be a nuisance in ponds and are often found mixed in with duckweed or mosquito fern. 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.

Q: Which flower human can eat?
A: They are the Hibiscus, Rose (heirloom variety such as Edward), Moringa flowers (drumstick), Roselle (gongura) and Basil flowers. It is perfect to prepare tea, soups, powders .

Q: What is smallest flower in the world?
A: Watermeal, Wolffia australiana, is the smallest known flowering monocot and is rich in protein. Despite its great potential as a biotech crop, basic research on Wolffia is in its infancy. Here, we generated the reference genome of a species of watermeal,

Q: Can humans consume duckweed?
A: Duckweed has a high protein content, which makes it valuable as human food. Consumption of sufficient protein is important for a good health. If duckweed is grown under optimal conditions, it can contain up to 40% of protein. This protein is relatively easily absorbed in the body.

Q: Why is Wolffia called watermeal?
A: Commonly called watermeal or duckweed, these aquatic plants resemble specks of cornmeal floating on the water. Individuals often float together in pairs or form floating mats with related plants, such as Lemna and Spirodela species. Schleid.

Q: Is watermeal an algae?
A: Watermeal is often misidentified as algae or “green pond scum.”” Watermeal can easily cover the entire pond

About the author

Samuel is a gardening professional and enthusiast who has spent over 20 years advising homeowners and farm owners on weed identification, prevention and removal. He has an undergraduate degree in plant and soil science from Michigan State University.