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Pest Information

Biennial Wormwood

Biennial Wormwood

  • Latin Name: Artemisia Biennis
  • Common Name: Biennial Wormwood
  • Other Names: N/A

Pest Details

Biennial Wormwood
Biennial Wormwood

Origin:

Native to the western United States and found commonly from Colorado to the west coast and north into Canada.

Biology:

An annual or biennial plant that reproduces from seeds. It is found most commonly near aquatic environments such as streams or lakes. The first year of growth may result only in a rosette of leaves near the ground, with flowering occurring the second year.

Identification:

Mature plants grow in an upright fashion to as high as 6 feet with thick, almost woody stems. The stems arise from a strong taproot and may branch into several stems near the base. Stems become reddish as the plant matures. Leaves are oval but divided into up to 7 leaflets, each of these being divided again or deeply lobed to numerous lobes. Overall the leaves at the middle or lower areas may be up to 5 inches long. Flowering occurs along the upper half of the plant, as long spikes arising from the base of the leaves on the stem. Flower spikes may be a foot long and contain hundreds of tiny, green to yellowish, inconspicuous flowers. Flowering occurs in the fall.

Characteristicts Important to Control:

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