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Parrot's Feather

A popular aquatic garden plant that spreads with water currents, animals, boats/trailers and fishing gear. Dense stands can stagnate water, and increase breeding grounds for mosquitoes learn more »

Zebra/Quagga Mussels

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Giant Hogweed

A towering toxic invasive plant with WorkSafe BC regulations learn more »

European Fire Ant

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Purple Loosestrife

An aggressive wetland invader that threatens plant and animal diversity learn more »

Orange Hawkweed

Also yellow, these invasive plants replace native vegetation along roadsides, and threaten areas not yet reforested learn more »

Japanese Knotweed

Grows aggressively through concrete, impacting roads and house foundations learn more »

Spotted Knapweed

A single plant spreads rapidly with up to 140,000 seeds per square metre learn more »

Scotch Broom

An evergreen shrub that invades rangelands, replaces forage plants, causes allergies in people, and is a serious competitor to conifer seedlings learn more »

Orange Hawkweed

Species
Hieracium aurantiacum

Hawkweeds (Hieracium spp.) are perennial plants with 14 non-native species recorded in BC, and are difficult to identify among the 8 native hawkweed species. One of the 14 non-native species, orange hawkweed (Hieracium aurantiacum) is currently the only hawkweed considered regionally noxious under the Weed Control Act. Most hawkweeds have yellow flowers.

Invasive hawkweeds are found throughout most forest regions and regional districts in BC. The regional districts east of the Rocky Mountains, Northern Rockies, and Peace River Regional Districts only have a few known invasive hawkweed sites and efforts to prevent further establishment and spread are actively underway. Orange hawkweed is regionally noxious in the East Kootenay, Central Kootenay, Columbia-Shuswap, Thompson-Nicola, Bulkley Nechako, and Cariboo Regional Districts.

Hawkweeds have bright orange, orange-red, or yellow ray flowers with several flower heads in clusters at the top of each plant. Leaves are long and oval-shaped, and cluster in a rosette formation at the base of fibrous, black-haired stems. Stems contain a milky fluid. Hawkweeds can grow up to 30-60 centimetres in height at maturity.

Hawkweeds spread through aboveground runners, horizontal roots, seeds, and root buds. Recreationalists, pack animals and hay contribute to new infestations. Hawkweeds flourish in well-drained, course-textured soils, and are found at low- to mid-elevations in BC. They can invade natural open areas and disturbed sites, including roadsides, pastures, and clearings. Hawkweeds’ main impact is on the forest industry, with the risk of establishment and spread along roads or areas that are not reforested. They can replace native vegetation in open, undisturbed natural areas such as meadows, reducing forage and threatening biodiversity.

A few native and ornamental alternatives to plant instead of hawkweeds include: Arkwright’s Campion; Pinks and Carnations; Alpine Aster; Heart-leaved Arnica; and Blanket Flower. Read more about these alternatives in the Grow Me Instead booklet for BC.

TIPS Factsheets

Gallery: Hawkweed (Yellow)