The official website for the Town of Halton Hills Ontario Canada. Halton Hills includes Georgetown, Acton, Stewarttown, Glenwilliams, Norval, Hornby, Limehouse, and Terra Cotta. Get Municipal News, By-law Information, Sustainability Tips, Recreation Swimming/Skating Schedules and everything else you would need to know about living, visiting, doing business in Halton Hills Ontario.

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    Invasive Species

    What are Invasive Species?

    • Plants, animals and micro-organisms that have been introduced (accidentally or deliberately) to non-native areas.
    •  They have negative impacts on the natural biodiversity/environment, economy and/or society, which can include human health.

    Giant Hogweed - Destroy Nuisance Weeds

    Giant HogweedWhat is it?

    • An invasive plant.
    • The sap of Giant Hogweed can negatively affect human health.
    • Can be found along roadsides, vacant lots and stream banks.

    Giant Hogweed Sap Can Cause:

    • Serious skin inflammation (photodermatitis).
    • The skin to be highly sensitive to UV rays due to a chemical called furanocoumarins.
    • Skin blisters, redness, scarring, and other discolouration that can last for years.
    • Temporary or permanent blindness if sap enters the eyes.
    • Reactions that can occur for up to 48 hours after contact.
    • Heat and moisture (sweat) can enhance the reaction.

    What does it look like?


    • 1 to 4 metres (3 – 14 feet)


    • Large white clusters of small flowers
    • Umbrella shaped
    • 30 to 60 cm in diameter (1 to 2 feet)


    • Up to 1 metre (3 feet) in diameter
    • Sharp coarse teeth
    • Compound leaves deeply divided into lobed toothed leaflets
    • Produces watery sap


    • Rough and bumpy
    • Course white hairs emerging from bumps
    • Hollow
    • Purple/red splotches

    How can I be exposed to the sap of giant hogweed?

    • Touching or brushing up against the plant.
    • Touching clothing or pets that have come into contact with the plant.
    • The sap can become airborne by pulling, cutting or mowing giant hogweed. This can cause sap to get in the eyes.

    What do I do if I accidentally come into contact with giant hogweed?

    • Wash the affected area immediately with soap and water.
    • Keep the affected area out of the sun for at least 48 hours.
    • Seek medical attention.

    What we do?

    If you find giant hogweed on municipal property please contact Public Works at
    905-873-2601 Ext. 2603.

    If you suspect Giant Hogweed is on your property:

    • Keep children and pets away from the area.
    • You are encouraged to contact a licensed weed exterminator. They can be found under “Weed Control Services” in the Yellow Pages.
    • If you choose to remove giant hogweed yourself, USE EXTREME CARE.
    • Information on Giant Hogweed removal methods and how to report a sighting can be found at
      DO NOT compost the plants. 
    • DO NOT place out for curbside collection either as Leaf & Yard Waste, Green Cart or waste material.
    • Giant hogweed must be taken to the Halton Waste Management Site for safe disposal.
    • Monitor the area for future growth.
    • Community Standards By-law 2008-0138 Part 3, Section 8 Nuisance Weeds states "Property Owners are required to destroy and remove all nuisance weeds and weed seeds on their land." Also see amendment: By-law No. 2014-0031.

    For more information on the Giant Hogweed please follow these links:

    Emerald Ash Borer (Agrilus planipennis)

    Emerald Ash BorerWhat is it?

    • Invasive and highly destructive insect.
    • Attacks and kills all Ash trees native to North America.
    • Brought to Canada unintentionally through wooden packing crates from Asia in the early 1990s.
    • Identified as an invasive alien species by the Canadian Food Inspection Agency (CFIA) for Halton in 2009.
    • Has the potential to eliminate ALL of our Ash trees (5-10% of our urban forest*).
    • A large section of Ontario and Quebec is under quarantine.
    • Movement of ash wood products outside of the regulated area is prohibited (click here for a map).

    *An urban forest refers to all of the collective varieties of trees that we have growing on our streets

    Signs of Emerald Ash Borer

    • Bark damage – vertical cracks in the bark
    • Discolouration or yellowing of leaves
    • D-shaped holes on bark and braches
    • Crown dieback - loss of leaves in the tree canopy
    • Shoots growing from trunk and branches of the tree
    • Increased presence of woodpeckers feeding

    Municipal Ash Tree Management

    The remaining street Ash trees can be considered “standing dead” as they will all succumb to the EAB over the next few years and the trees will be removed and replaced as time and budget allows.

    See the “Emerald Ash Borer Management Strategy” Council Report 2012-0034 from October 15, 2012, for more information.
    If you suspect EAB on a tree located on Town property, please contact Public Works at 905-873-2601 Ext. 2603 to request service.
    If you suspect a tree on your property is infested, or are interested in treating a tree on your property, please call a certified arborist for more information.

    Further information can be found by following these links:




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