Hemlock (Conium maculatum)

Profile

Impact

Hemlock is a robust biennial herb growing 1-2.5 metres high, with hollow stems that have reddish-brown or purple spots on the outer surface. The leaves have a sharp offensive odour when crushed.

It is a weed of disturbed areas, often occurring near stockyards and along roadsides and riverbanks.

Hemlock is native to Europe, China and northern Africa.

Toxicity

Hemlock is highly toxic to livestock and humans, but is avoided by livestock. In humans it is capable of causing serious illness or death, and all parts of the plant are poisonous when ingested. Symptoms include nervousness, trembling and then respiratory distress. 

What to do if poisoning occurs:

  • If the patient is unconscious, unresponsive or having difficulty breathing dial 000 or get to the emergency section of a hospital immediately.
  • If the patient is conscious and responsive call the Poisons Information Centre on 13 11 26 or your doctor.
  • If going to a hospital take a piece of the plant for identification.

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Control

Herbicide options

WARNING - ALWAYS READ THE LABEL
Users of agricultural or veterinary chemical products must always read the label and any permit, before using the product, and strictly comply with the directions on the label and the conditions of any permit. Users are not absolved from compliance with the directions on the label or the conditions of the permit by reason of any statement made or not made in this information. To view permits or product labels go to the Australian Pesticides and Veterinary Medicines Authority website www.apvma.gov.au

See Using herbicides for more information.


MCPA 340 g/L + Dicamba 80 g/L (Kamba® M)
Rate: 80 mL per 15 L of water
Comments: Knapsack spray.
Withholding period: 7 days.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate


MCPA 340 g/L + Dicamba 80 g/L (Kamba® M)
Rate: 350 mL per 100 L of water
Comments: High volume spot spray.
Withholding period: 7 days.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate


MCPA 340 g/L + Dicamba 80 g/L (Kamba® M)
Rate: 5.2 L/ha
Comments: Boom spray rate. Young active growth, repeat treatments may be necessary.
Withholding period: 7 days.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate


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Legal requirements

The content provided here is for information purposes only and is taken from the Noxious Weeds Act 1993.

Area Class Legal requirements
Mid-Western Regional 4 Locally Controlled Weed
The growth of the plant must be managed in a manner that continuously inhibits the ability of the plant to spread
Queanbeyan-Palerang Regional 4 Locally Controlled Weed
The growth of the plant must be managed in a manner that continuously inhibits the ability of the plant to spread only in the area formerly known as Queanbeyan City Council

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For technical advice and assistance with identification please contact your local council weeds officer.
For further information call the NSW Invasive Plants and Animals Enquiry Line on 1800 680 244 or send an email to weeds@dpi.nsw.gov.au

Reviewed 2014