Report and remove invasive plants

Report invasive speciesManaging invasive species in parks and on trails

Do not touch giant hogweed



How to identify giant hogweed

  • Tall, thick stem with reddish spots that stands 10 to 15 feet high
  • Umbrella-shaped white flower head with a flat top
  • Often mistaken for Queen Anne’s lace, cow parsnip and angelica; giant hogweed is much larger

How to get rid of giant hogweed

The safest way to get rid of giant hogweed is to call a professional service. If you must remove it yourself, follow the proper safety protocols.

  1. Wear protective clothing including gloves, pants, long sleeves, eye protection, raincoat, and boots
  2. Remove flower heads to prevent seeds from growing
  3. Cut plant roots 3-5 inches below the soil
  4. Throw away the plant in a double-bagged garbage bag, sealed. Do not compost.
  5. Wash the clothes you wore during removal
  6. Watch for any new growth and remove as needed

Giant hogweed is an invasive plant originally from Asia. The sap of giant hogweed is dangerous to the skin, causing inflammation, burns and possibly blindness if it comes into contact with the eyes.

Dog-strangling vine

A photo depicting the leaves of dog strangling vine. They are long, dark green and oval, coming to a sharp point. The flowers are a light pink and look like tiny stars.

Photo by R. A. Nonenmacher

How to identify dog-strangling vine

  • Grows one to two metres high, twining on to other plants and trees
  • Its leaves are shiny, yellow-green and dark green in the shape of ovals with a pointy tip
  • Produces pink or purple star-shaped flowers with five petals in late June
  • Produces bean-shaped pods that are four-seven centimetres long that open to release feathery white seeds in late summer

How to get rid of dog-strangling vine

  1. Cut at the base
  2. Throw it in the garbage, not your compost!
  3. Do not let it flower or seed

Dog-strangling vine is an invasive species from Europe that is spreading rapidly throughout Ontario. This plant species smothers native plants and young trees which reduces habitat for birds, pollinators, and insects. It also increases wildlife grazing on native species.


Ontario’s Invading Species Awareness Program
Stop the spread of invasive species