Alphabetical Plant Listing

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) 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.

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Requirements

Hardiness 4 – 10
Plant Type Aquatic Plants
Exposure Full Sun
Season of Interest Summer (Early,Mid,Late)
Fall
Height 2" – 3" (5cm – 7cm)
Spread 1' – 3' (30cm – 90cm)
Spacing 12" – 36" (30cm – 90cm)
Water Needs High
Maintenance Average
Soil pH Acid, Alkaline, Neutral
Soil Drainage Poorly Drained
Characteristics Semi-Evergreen
Native Plants United States, California, Midwest, Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin, Northeast, Connecticut, Delaware, Maine, Massachusetts, Maryland, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, Pacific Northwest, Idaho, Oregon, Washington, Rocky Mountains, Colorado, Montana, Utah, Wyoming, Southeast, Alabama, Arkansas, Florida, Georgia, Kentucky, Mississippi, North Carolina, South Carolina, Tennessee, Virginia, West Virginia, Southwest, Nevada, Arizona, New Mexico, Oklahoma
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.


Requirements

Hardiness 4 – 10
Plant Type Aquatic Plants
Exposure Full Sun
Season of Interest Summer (Early,Mid,Late)
Fall
Height 2" – 3" (5cm – 7cm)
Spread 1' – 3' (30cm – 90cm)
Spacing 12" – 36" (30cm – 90cm)
Water Needs High
Maintenance Average
Soil pH Acid, Alkaline, Neutral
Soil Drainage Poorly Drained
Characteristics Semi-Evergreen
Native Plants United States, California, Midwest, Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin, Northeast, Connecticut, Delaware, Maine, Massachusetts, Maryland, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, Pacific Northwest, Idaho, Oregon, Washington, Rocky Mountains, Colorado, Montana, Utah, Wyoming, Southeast, Alabama, Arkansas, Florida, Georgia, Kentucky, Mississippi, North Carolina, South Carolina, Tennessee, Virginia, West Virginia, Southwest, Nevada, Arizona, New Mexico, Oklahoma
Garden Uses Ponds and Streams, Rain Gardens, Water Gardens

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