Resistant weeds in Canada

The following are resistant weeds that are known to exist across the country.

Weed Group(s)
Ball mustard Group 2
Chickweed Group 2
Cleavers Group 2, Group 4
Cow cockle Group 2
Green foxtail Group 1, Group 3
Hemp-nettle Group 2, Group 4
Kochia Group 2, Group 9
Narrow-leaved hawk's beard Group 2
Shepherd's-purse Group 2
Sow thistle Group 2
Stinkweed Group 2
Wild buckwheat Group 2
Wild oats Group 1, Group 2, Group 8

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Weed Group(s)
Chickweed Group 2
Cleavers Group 2
Green foxtail Group 1, Group 3
Kochia Group 2, Group 9
Lamb’s quarters Group 2
Persian darnel Group 1
Redroot pigweed Group 2
Russian thistle Group 2
Shepherd’s-purse Group 2
Stinkweed Group 2
Wild mustard Group 2
Wild oat Group 1, Group 2, Group 8

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Weed Group(s)
Chickweed Group 2
Cleavers Group 2
Green foxtail Group 1, Group 2, Group 3
Hemp-nettle Group 2
Kochia Group 2, Group 9
Pale smartweed Group 2
Powell amaranth Group 2
Redroot pigweed Group 2
Stinkweed Group 2
Wild mustard Group 2, Group 4, Group 5
Wild oat Group 1, Group 2, Group 8

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Weed Group(s)
Wild carrot Group 4
Common lamb's quarters Group 5
Green pigweed (also known as Powell's amaranth), red root pigweed, common ragweed Group 5
Barnyard grass, yellow foxtail, old witch grass Group 5
Late flowering goosefoot, wild mustard, common groundsel Group 5
Canada fleabane (also known as mare's-tail) Group 22
Red root pigweed, green pigweed (also known as Powell's amaranth), Eastern black nightshade, ragweed Group 2
Green pigweed (also known as Powell's amaranth) Group 7
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