Invasive Plants

Invasive plants kill native plants and destroy Coquitlam's beautiful natural habitat. We need your help to stop the introduction and spread of garden plants that can be harmful to people, animals and ecosystems.

Bad SeedInvasive plants harm the environment.

Invasive plants are non-native plants that were introduced to our environment through seeds, cuttings, garden plants, etc. They spread aggressively and take over the natural environment. They push out native plants, including endangered species, and destroy habitat for fish, birds and other wildlife. They can also cause erosion and silt problems in creeks and impact aquatic creatures. Invasive plants are expensive to control and eradicate. Some, like Giant Hogweed, are even dangerous to human health. Quite simply, they are Bad Seeds.

Read Coquitlam's Invasive Plant Management Strategy for more information.

Volunteering Opportunities

Are you interested in becoming a Bad Seed volunteer? It’s easy — just show up to one of our Bad Seed events.

If you're a group of 10 or more, please contact to register in advance. Smaller groups and individuals do not need to register.​

Please bring a water bottle and dress for the weather and in clothes that can get dirty, including close-toed shoes. We'll provide snacks, light refreshments, tools and gloves.

Help prevent invasive plants from spreading.

  • Never dump garden waste or hanging baskets into natural areas.
  • Dispose of invasvie plant material through the City’s Green Can Program (see below for hogweed disposal requirements).
  • Avoid buying plants promoted as fast spreaders or vigorous self-seeders as they are often invasive.
  • Grow native plants in your garden - for more information contact the Native Plant Society of British Columbia
  • Contain or remove invasive plants on your property to prevent them from spreading to other properties.
  • Control weeds that grow under bird feeders from falling seeds as they can become a source of invasive plants.
  • Use caution when ordering plant seeds over the Internet or through catalogues. Introducing foreign seeds are a key way that invasive plants find their way into our community.
  • Read Grow Me Instead to learn about BC's most "unwanted" plants, along with recommended alternatives.
Common Invasive Plant Species

English Ivy

Hedera helix

A climber that smothers almost all vegetation and can kill trees.

English Ivy

Yellow Lamium

Lamiastrum galeobdolon

Common to hanging baskets, it acts like ivy, smothering native plants.

Yellow Lamium


Vinca minor

This trailing vine displaces native plants needed by wildlife.


Morning Glory

Convolvulus arvensis

This very persistent climbing vine smothers native plants.

Morning Glory

Japanese Knotweed

Fallopia japonica

Dense, tall thickets can grow from a small root or stem, crowding out other plants.

Japanese Knotweed

Giant Hogweed

Heracleum mantegazzianum

Known for its umbrella shaped flower heads, it can reach up to 15 feet and its sap can cause severe burns.

Giant Hogweed

Giant Hogweed

Giant Hogweed is a non-native invasive plant recently found in Coquitlam.  Giant Hogweed poses a serious threat to human health and the environment. The clear sap found in its stem and hairs can result in severe burns and blistering.  Children have used the large, hollow stems as pea shooters and telescopes resulting in burns to the mouth and/or eyes. If sap enters the eyes, it can cause temporary or permanent blindness.

Staff are monitoring public lands for signs of Giant Hogweed and are asking for the community's help to identify and eliminate Giant Hogweed in Coquitlam.

Please report Giant Hogweed in Coquitlam, by using the Online Hogweed Reporting Form or by contacting:

Parks, Recreation and Culture
Phone: 604-927-6300


  • Very tall, reaching up to 5 metres
  • White flower heads reach up to 1.5 metres in diameter, bloom in mid August 
  • Leaves are shiny and large with coarse, jagged edges
  • Stalks have purple spots or streaks and stiff bristly hairs 
  • Typically grows on riverbanks, ravines, vacant lots or along roads, but can also occur on residential property

Removal and Disposal of Hogweed

If you find Giant Hogweed on your property, it needs to be removed as per the City's Noxious Weed Bylaw No. 4181, 2010.

  • It is best to let a professional remove this plant
  • CAUTION - If you are going to remove the plant yourself, always wear protective, waterproof clothing, gloves and safety goggles and follow Work Safe BC instructions on their safety bulletin and video.  
  • Dispose of all plant parts in double-bagged kraft paper bags and place in Green Can for curbside collection.
  • Do not transfer soil from within four metres of the plant as the soil may contain Giant Hogweed seed.
  • Continue to monitor the area for several years.
  • If you are exposed to Giant Hogweed, wash the affected area immediately, keep it out of the sun and seek medical advice.

Parks Customer Service

For any concerns or enquiries, please contact us:
Phone:  604-927-6300