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Pest Information

Rattlesnake Mannagrass

Rattlesnake Mannagrass

  • Latin Name: Glyceria Canadensis
  • Common Name: Rattlesnake Mannagrass
  • Other Names: N/A

Pest Details

Rattlesnake Mannagrass
Rattlesnake Mannagrass
Rattlesnake Mannagrass


Native to North America, and found in southern Canada, and in the United States in the Pacific Northwest, north Central, and northeast states.


A perennial with reproduction from seeds. Plants grow along the edges of waterways, either on the very wet edge soil or in the shallow water habitats, and they are capable of growing in extensive patches. Plants may spread by underground tubers which, in aquatic growth, may also trail along the surface of the substrate.


Mature plants may be up to 4 feet in height, with a foot or more of this below water level. Stems are erect and reddish in color. Leaves are long, thick blades up to ½ inch wide and 2 feet long. The flower heads are open, branching clusters of numerous seed heads, each with 6 to 10 flowers in a compact group.

Characteristicts Important to Control:

Control is normally not needed for this native plant, but where growth interferes with water movement a systemic herbicide labeled for aquatic use may effectively kill all plant parts.

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