Invasive Weeds

Invasive plants are weeds that have been introduced to British Columbia without the insect predators and plant pathogens that help keep them in check in their native habitats. Without natural enemies, these invaders can rapidly choke out native plants and agricultural crops.

Invasive Weed Control Program

Our Invasive Weed Control Program targets Wild Chervil, Tansy Ragwort, Giant Hogweed and Knotweed in Electoral Areas C, D, E, G, and H, as well as in Chilliwack and Abbotsford.

All FVRD residents are responsible for controlling invasive weeds on their private property. If you have questions about identification, would like further instructions on effective control, or to request a pickup of weeds you have bagged from your property, call the Morrow BioScience hotline at 1-877-986-3363 or email All weeds must be bagged, labelled "Invasive Weeds", and left at the front of your property. Tansy ragwort can also be placed in your organics curbside pickup container for disposal.

Giant Hogweed

This massive plant grows from 3 – 5m tall and produces white flowers arranged in clusters up to 1m wide. Its hollow, rigid stalk is 6 - 10cm in diameter with dark reddish-purple spots and bristles. The leaves resemble very large, jagged maple leafs and can expand to 1.5m wide.

Contact with Giant Hogweed can cause severe burns.

Look-alike weeds:

  • Cow Parsnip: Grows to 1-3m tall. Its stem does not have purple spots, and its leaves are smaller and less jagged than those of Hogweed.


Knotweed stems have reddish-brown specks and resemble bamboo. Its leaves are heart-shaped, and may be elongated. Its flowers are pinkish-white or greenish-white, and form feathery clusters at the base of each leaf.

Look-alike weeds:

  • Bamboo: Has very narrow and elongated leaves.

Tansy Ragwort

Mature Tansy Ragwort plants grow from 0.3m to 2m tall, and can be identified by their bright yellow daisy-like flowers and ragged leaves. Many stems can grow from one central root, with a cluster of flowers growing on top of each stem.

Look-alike weeds:

  • Common Tansy: Has a button-like yellow flower with no distinct petals.

  • St. John's Wort: Has a yellow flower with only five petals, and a distinctive centre with multiple antennae.

Wild Chervil

Wild Chervil can grow up to 2m tall and can be identified by its white flower and fern-like leaf. Its flowers have five petals and are clustered together at the end of a single stem.

Look-alike weeds:

  • Goutweed (Aegopodium podagraria): Its leaves have white borders around the edges, and are not fern-like in appearance.

  • Poison Hemlock (Conium Maculatum): Has purple spots on the stems and is most easily distinguished by its size since it can grow from to 2 to 3m high.