Poison Hemlock

Poison Hemlock

Fact Sheet

ALERT SPP This Plant is on high alert.


Latin Name: Conium maculatum

Origin:  Europe

Physical Description: Biennial herb with a whitish taproot. Stems are branching, erect, hollow and can grow up to 2m tall. They are bright green and mottled with purple splotches and produce an undesirable odour when crushed. Leaves are bright green, 0.5m long, and finely divided. Small white flowers form an umbrella-like cluster at the top of the stems.

Habitat: Prefers moist habitats and can be found along roadsides, on edges of cultivated fields, along creek beds and irrigation ditches, and in waste areas.

Impacts:  Highly toxic to humans, animals and livestock when consumed.

Reproduction:  Seed only.

Management Options

Mechanical: Small infestations can be hand pulled or dug as long as the entire tap root is removed. Due to the toxicity of this plant, personal protective gear, such as gloves, should be worn during mechanical removal.

Chemical: Several herbicides with the following active ingredients can control Poison hemlock: 2,4-D, triclopyr, glyphosate, chlorsulfuron, imazapyr and metsulfuron.  For available products, contact your local agri-supply store. Prior to any herbicide application, read and follow the label instructions.

Biological: Not available.

Additional Resources:

Capital Regional District. Invasive Species Alert Sheet. Poison Hemlock

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