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Brooks
Medicine Hat
Lethbridge
Glenwood
Calgary
Species Maps – Spiny annual sow-thistle
247
Spiny annual sow-thistle,
Sonchus asper
Not irrigated
0.1 to 10.0%
20.1 to 30.0%
40.1 to 50.0%
60.1 to 70.0%
Absent
10.1 to 20.0%
30.1 to 40.0%
50.1 to 60.0%
More than 70%
Frequency