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Elodea canadensis (Canadian Waterweed)

Canadian Waterweed, Canadian Pondweed, American Waterweed, Canadian Waterweed, Choke Pondweed, Ditch Moss, Little Snakeweed, Water Thyme, Anacharis canadensis, Anacharis canadensis var. planchonii, Elodea brandegeeae, Elodea ioensis, Elodea linearis, Elodea planchonii, Philotria canadensis, Philotria linearis

Elodea canadensis, Canadian Waterweed, Canadian Pondweed, American Waterweed, Canadian Waterweed, Choke Pondweed, Ditch Moss, Little Snakeweed, Water Thyme

Elodea canadensis (Canadian Waterweed) is a semi-evergreen, submerged aquatic perennial with clusters of elongated branching stems densely clothed with short, recurved, dark green leaves in whorls of three. Blooming from late spring through fall, this aquatic plant boasts a profusion of tiny, greenish-white flowers. Canadian Waterweed is dioecious with male and female flowers appearing on separate plants. Since male plants are less common than female in its native range, it reproduces asexually via vegetative fragments and turions (overwintering buds). Turions or short, densely-leaved resistant stems, develop then break off to float around the water body before they sink to the bottom over winter, where they rest until they re-grow in spring. Native to North America, Canadian Waterweed is useful as oxygenator in water gardens or aquariums, and as shelter for small fishes and aquatic invertebrates. By absorbing nutrients, it helps control algae and keep waters clear. Canadian Waterweed is a popular plant for water gardens and cool water aquariums.

  • Grows up to 3 in. tall (7 cm) and 12-36 in. wide (30-90 cm). This plant will spread rapidly and can take over larger bodies of water, but is relatively easy to control in small water gardens.
  • Performs best in full sun as a submerged aquatic, either anchored or free-floating, in water gardens.
  • A fine choice for water gardens, large aquariums. Not recommended for large ponds where control can be more difficult.
  • No serious pest or disease issues.
  • Remove or clip stems as needed to control population.
  • Spreads by stem fragments.
  • Native to North America.
  • Canadian Waterweed is considered invasive in Australia, New Zealand, Cuba, Alaska and the majority of European countries where it is present.
  • Before planting outdoors, gardeners should contact their local department of fish and wildlife for more information on invasive species and noxious weeds.

Requirements

Hardiness 4 - 10
Plant Type Aquatic Plants
Plant Family Hydrocharitaceae
Exposure Full Sun
Season of Interest Summer (Early, Mid, Late)
Fall
Height 2" - 3"
(5cm - 8cm)
Spread 1' - 3'
(30cm - 90cm)
Spacing 12" - 36"
(30cm - 90cm)
Maintenance Average
Water Needs High
Soil pH Acid, Alkaline, Neutral
Soil Drainage Poorly Drained
Characteristics Semi-Evergreen
Native Plants California, United States, Northeast, Pennsylvania, Rhode Island, Vermont, Connecticut, Delaware, Maine, Massachusetts, Maryland, New Hampshire, New Jersey, New York, South Dakota, Ohio, North Dakota, Wisconsin, Minnesota, Midwest, Nebraska, Missouri, Michigan, Illinois, Kansas, Iowa, Indiana, Oregon, Washington, Pacific Northwest, Idaho, Southeast, Mississippi, North Carolina, South Carolina, Tennessee, Virginia, West Virginia, Alabama, Arkansas, Florida, Georgia, Kentucky, Southwest, Arizona, Nevada, New Mexico, Oklahoma, Montana, Rocky Mountains, Utah, Colorado, Wyoming
Garden Uses Ponds And Streams, Rain Gardens, Water Gardens
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While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.
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Requirements

Hardiness 4 - 10
Plant Type Aquatic Plants
Plant Family Hydrocharitaceae
Exposure Full Sun
Season of Interest Summer (Early, Mid, Late)
Fall
Height 2" - 3"
(5cm - 8cm)
Spread 1' - 3'
(30cm - 90cm)
Spacing 12" - 36"
(30cm - 90cm)
Maintenance Average
Water Needs High
Soil pH Acid, Alkaline, Neutral
Soil Drainage Poorly Drained
Characteristics Semi-Evergreen
Native Plants California, United States, Northeast, Pennsylvania, Rhode Island, Vermont, Connecticut, Delaware, Maine, Massachusetts, Maryland, New Hampshire, New Jersey, New York, South Dakota, Ohio, North Dakota, Wisconsin, Minnesota, Midwest, Nebraska, Missouri, Michigan, Illinois, Kansas, Iowa, Indiana, Oregon, Washington, Pacific Northwest, Idaho, Southeast, Mississippi, North Carolina, South Carolina, Tennessee, Virginia, West Virginia, Alabama, Arkansas, Florida, Georgia, Kentucky, Southwest, Arizona, Nevada, New Mexico, Oklahoma, Montana, Rocky Mountains, Utah, Colorado, Wyoming
Garden Uses Ponds And Streams, Rain Gardens, Water Gardens
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Do I Need?

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