Noxious and Invasive Plants of Calgary, AB

This guide aims to educate users in recognizing some of Alberta's invasive plants and to help document their distribution.

The following list includes noxious and invasive plants outlined by the Province of Alberta and City of Calgary as prohibited noxious weeds and plants. ...more ↓

All 74

tansy ¹
Tanacetum vulgare

creeping thistle ²
Cirsium arvense

scentless mayweed ³
Tripleurospermum inodorum

greater burdock ⁴
Arctium lappa

Woolly Burdock ⁵
Arctium tomentosum

lesser burdock ⁶
Arctium minus

oxeye daisy ⁷
Leucanthemum vulgare

Perennial Sow Thistle ⁸
Sonchus arvensis

black knapweed ⁹
Centaurea nigra

Giant Knapweed ¹
Centaurea macrocephala

diffuse knapweed ¹⁰
Centaurea diffusa

Brown Knapweed ¹¹
Centaurea jacea

bearded creeper ¹²
Crupina vulgaris

Centaurea ×psammogena ¹³

meadow hawkweed ¹⁴
Pilosella caespitosa

Monckton's Knapweed ¹⁵
Centaurea × moncktonii

Marsh Thistle ¹⁶
Cirsium palustre

mouse-eared hawkweed ¹⁷
Pilosella officinarum

musk thistle ¹⁸
Carduus nutans

orange hawkweed ¹⁹
Pilosella aurantiaca

Broad-winged Thistle ²⁰
Carduus acanthoides

Rush Skeletonweed ²¹
Chondrilla juncea

Centaurea alba strepens

Russian knapweed ²²
Leuzea repens

Tyrol knapweed ²³
Centaurea nigrescens

ragwort ²⁴
Jacobaea vulgaris

Yellow Starthistle ²⁵
Centaurea solstitialis

Edited by Matt Wallace, some rights reserved (CC BY-SA)

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Noxious and Invasive Plants of Calgary, AB

tansy 1 Tanacetum vulgare

creeping thistle 2 Cirsium arvense

scentless mayweed 3 Tripleurospermum inodorum

greater burdock 4 Arctium lappa

Woolly Burdock 5 Arctium tomentosum

lesser burdock 6 Arctium minus

oxeye daisy 7 Leucanthemum vulgare

Perennial Sow Thistle 8 Sonchus arvensis

black knapweed 9 Centaurea nigra

Giant Knapweed 1 Centaurea macrocephala

diffuse knapweed 10 Centaurea diffusa

Brown Knapweed 11 Centaurea jacea

bearded creeper 12 Crupina vulgaris

Centaurea ×psammogena 13

meadow hawkweed 14 Pilosella caespitosa

Monckton's Knapweed 15 Centaurea × moncktonii

Marsh Thistle 16 Cirsium palustre

mouse-eared hawkweed 17 Pilosella officinarum

musk thistle 18 Carduus nutans

orange hawkweed 19 Pilosella aurantiaca

Broad-winged Thistle 20 Carduus acanthoides

Rush Skeletonweed 21 Chondrilla juncea