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Slender foxtail - Alopecurus myosuroides

Weed Seed - Slender foxtail (Alopecurus myosuroides)

Slender foxtail is one of the most damaging invasive plants affecting winter cereals, winter wheat, grass seed, rapeseed, forage legumes and barley. It spreads quickly in cultivated crops, competing for light, nutrients, space and water. This results in significant yield loss.

Its eradication from cultivated fields is difficult, since many populations are resistant to commonly used grass herbicides.

Where it's found

Slender foxtail has been reported in British Columbia and Manitoba, but has never become established. Slender foxtail is native to northern Africa, Asia and Europe and has spread to Australia, China, New Zealand, North America, and South America. It has become a major issue in parts of the north-western United States.

Slender foxtail is commonly found in cultivated fields, moist meadows, forests and disturbed ground.

What it looks like

Slender foxtail is an upright annual grass growing 20-80 cm tall. Stems are slender, and leaves are hairless, elongated and flat. Seed heads are reddish-purple spikes, 2-12 cm long, dense, cylindrical and tapered at both ends.

How it spreads

Slender foxtail is able to spread quickly due to its abundant seed production. It is naturally dispersed by wind over short distances. Slender foxtail is often introduced to new areas in contaminated seed lots or on farm machinery.


Slender foxtail is regulated as a pest in Canada under the Plant Protection Act. It is also listed as a prohibited noxious weed on the Weed Seeds Order, 2016 under the Seeds Act. Importation and domestic movement of regulated plants and their propagative parts is prohibited.

What you can do about it

Learn more about invasive species.

Slender foxtail panicle
Slender foxtail panicle
Slender foxtail plants
Slender foxtail plants
Kurt Stueber (
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