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September - Hemlock

HemlockHemlock (Conium maculatum)

Hemlock thrives in damp conditions and is commonly found throughout New Zealand in ditches and riverbeds as well as on banks and roadsides. This weed quickly establishes in waste areas where there is no other plant competition. When crushed, hemlock has a strong unpleasant smell.

Hemlock is a biennial plant that can grow up to 2-3 metres tall and has fern like leaves up to 40cm in length. Main stems produce small white flowers during the spring and summer months. Stems are hollow, flecked brownish purple and arise from a central taproot. Hemlock is often mistaken for fennel.

Hemlock is poisonous but is avoided by most stock due to its unpleasant smell. Although plants die after flowering, dried remains are still poisonous.

  • Young Pasture
    Hemlock is not well controlled in young pasture. Spot treatments with either Pasture-Kleen* or Tordon* Gold herbicides are recommended.
  • Established Pasture
    Pasture Kleen will provide excellent control of seedling and small plants in established pasture. Apply 1L/ha for seedlings and/or 2L/ha for small plants. Larger plants are not well controlled by Pasture-Kleen and require treatment with Tordon Gold.
  • Spot Spraying:
    Tordon Gold or Tordon 2G are the preferred herbicides. Both products are grass friendly but will temporarily remove clovers from the sward. Tordon 2G is a granular herbicide that is placed around the base of the plant and absorbed through the roots.

Pasture-Kleen Herbicide: registered pursuant to the Pesticides Act 1979 No. 5106
Tordon Gold Herbicide: registered pursuant to the Pesticides Act 1979 No. 5660

For a copy of the new Preside brochure see your local farm merchandise store or call Dow AgroSciences on 0800 803939.

*Registered trademark of Dow AgroSciences.

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