Top 20 Most Common Weeds in Canada

Canada's diverse climate, from cold winters to warm summers, cultivates a robust array of garden weeds. These invaders, such as Common milkweed, Lambsquarters, and Garlic mustard, exploit the fertile soils and varying weather conditions to proliferate. Gardeners across the nation often grapple with these persistent weeds, which pose a common challenge in maintaining healthy, aesthetically pleasing landscapes. Despite diligent efforts to manage them, these species remain a prevalent nuisance in Canadian gardens.

Most Common Weeds

1. Common milkweed

Asclepias syriaca, commonly known as common milkweed, is a flowering perennial herbaceous plant native to North America. It contains milky latex which can be toxic to sheep, cows, and other larger mammals (including humans) if it is consumed in large amounts. Many insect species are attracted to common milkweed, most notably monarch butterflies.

Growth Rate:

Rapid

2. Lambsquarters

Lambsquarters has many other names, including pigweed, goosefoot, and bacon weed. This plant seems to appear out of nowhere and is considered by many to be a pesky weed. However, the greens of this plant are edible, can be prepared similar to spinach, and are packed with nutrients.

Growth Rate:

Rapid

3. Bittersweet

The species known as bittersweet is a semi-woody vine found in forests, marshes, shrublands, and hedgerows. All parts of the plant contain alkaloids (especially the bright red berries), which are extremely poisonous to humans and livestock if ingested. In spite of its toxicity, bittersweet was hung as a talisman in the past to ward off witchcraft.

Growth Rate:

Moderate

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4. Garlic mustard

Alliaria petiolata, colloquially known as garlic mustard is a herbaceous biennial plant known for the garlic aroma and smell of its crushed leaves. It can be found in partially shaded and moist places like woodland edges, trails, hedges, and roadsides. Leaves of garlic mustard are used in European cuisine as a spice herb for salads and sauces.

Growth Rate:

Rapid

5. Annual ragweed

Annual ragweed (Ambrosia artemisiifolia) is one of the most notorious weeds in the world. It is an annual herbaceous plant with highly allergenic pollen and a very vigorous spread. Annual ragweed is a very competitive species, which is why its presence in cultivated plants is highly undesirable.

Growth Rate:

Rapid

6. Common mullein

Common mullein (Verbascum thapsus) has been cultivated by farmers and gardeners since colonial times. This herb has a thick stem and leaves covered with a layer of “fur” that feels like flannel. Today, it grows wild in many areas of the U.S., including roadsides and vacant lots. Flowers of common mullein are occasionally brewed into a tea.

Growth Rate:

Rapid

7. Canada goldenrod

The Solidago canadensis, colloquially known as canada goldenrod, is a perennial herb native to North America. This plant can be found growing in a variety of different habitats, and it often forms colonies. In many parts of Europe and East Asia, canada goldenrod is considered an invasive species.

8. Horseweed

Horseweed is a North American herbaceous annual plant with a hairy stem, numerous pointed leaves, and waxy inflorescence. It has been naturalized in Eurasia and Australia, where it is a common weed in urban and agricultural regions. Horseweed can be used in a survival situation to start a friction fire.

9. Lesser burdock

Lesser burdock (Arctium minus) grows flower bracts similar to those of thistle with small hooks arrayed all about to help it spread its seeds. If the hooks look like Velcro, that's no surprise; burdocks were reportedly the original inspiration for the fastener material. With adequate preparation, the roots are edible. The lesser burdock is also an important food source for painted lady butterfly caterpillars.

Growth Rate:

Rapid

10. Common dandelion

*Taraxacum officinale*, widely known as common dandelion, is a herbaceous perennial that can be found in temperate regions all over the world, in habitats with moist soils. The most popular feature of this plant is its fruits, furry spheres that are easily carried by the wind. Although it is generally considered a weed, common dandelion is actually edible and very nutritious.

Growth Rate:

Rapid

11. Common motherwort

Common motherwort is a wildflower that is attractive but has weed-like tendencies. It is classified as an invasive species in some areas. The flowers are pinkish-purple and hairy and bloom throughout the summer. This plant is commonly found in woodland areas, fields, or disturbed areas.

12. Stinging nettle

Although the stinging nettle has a variety of uses it is best known for its eponymous sting. It has sharp defensive hairs on its leaves and stems which will release pain-inducing chemicals when touched. Nevertheless, Dorset, England hosts an annual World Nettle Eating Championship, which started with a debate between two farmers over the severity of their nettle infestations. To consume them more safely, stinging nettles must be thoroughly boiled.

Growth Rate:

Rapid

13. Common bird's-foot trefoil

Common bird's-foot trefoil (Lotus corniculatus) is a common flowering perennial plant that grows widely throughout Europe and North America. Commercially, it is often added to livestock feed to prevent bloating. In Britain, common bird's-foot trefoil is often referred to as "butter and eggs" due to its flowering appearance and golden color. It attracts bumblebees and is considered an invasive species in North America and Australia.

14. Common purslane

Portulaca oleracea, colloquially known as common purslane, is an annual succulent species with reddish stems and tiny yellow, five-petal flowers. It is used for culinary purposes in various parts of the world, most often raw, in salads. Common purslane is also a good companion plant for crops that thrive in moist soils.

Growth Rate:

Rapid

15. Bird vetch

Bird vetch (Vicia cracca) is a flowering species of vetch native to Europe and Asia. In North America, bird vetch is considered an invasive species and a weed. In these environments, the flowering plant often grows in industrial disturbed environments like oil fields.

16. Creeping thistle

This aggressive weed spreads across grasslands and fields via underground roots that creep horizontally, some for more than 5 m. It can cause major problems to agriculture if its growth is left unchecked. Its seeds feed many birds as well as pest insects. Creeping thistle is generally considered a noxious weed even in its native territory.

Growth Rate:

Rapid

17. Poison ivy

In pop culture, poison ivy is a symbol of an obnoxious weed because, despite its unthreatening looks, it gives a highly unpleasant contact rash to the unfortunate person who touches it. Still, it is commonly eaten by many animals, and the seeds are a favorite with birds. The leaves turn bright red in fall. Its sister species, Western poison ivy (Toxicodendron rydbergii), is not considered to be invasive in the United States, but is noxious in Australia and New Zealand.

Growth Rate:

Rapid

18. Bull thistle

Bull thistle (Cirsium vulgare) is a thistle plant native to Europe, Africa, and Asia. Bull thistle produces a large amount of nectar and attracts pollinators. Bull thistle is considered a noxious weed in areas of Europe and Australia.

19. Common plantain

While native to Europe, the common plantain was one of the first plants to reach North America through early European explorers. Native Americans have referred to Plantago major as 'white man's footprint', as it disrupted many local ecosystems by its introduction.

Growth Rate:

Moderate

20. False solomon's seal

False solomon's seal (*Maianthemum racemosum*) is a flowering woodland plant native to North America. False solomon's seal is also called the Feathery False Lily of the Valley. This plant is named "false Solomon's seal" because it resembles Solomon’s Seal, a flowering plant with red or black berries. Both are in the same family and are frequently found growing together. Native American tribes used false solomon's seal leaves to brew tea.

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In Canada, you can find Common buckthorn, Common milkweed, Box elder, Tomato, Golden pothos, and more! There are 50 types of plants in total. Be sure to look out for these common plants when you’re walking on the streets, in parks, or public gardens.