Below are 'Prohibited Noxious Weed Seeds' listed in the 'Weed Seeds Order, 1986'. This list was obtained from the Federal Dept. of Agriculture (Canadian Food Inspection Agency). I was told by a senior official in the Department that it is illegal to import any seeds (even one packet) from these plant species into Canada.
However, this legislation may change in the next couple of years. The Canadian Food Inspection Agency is now recommending that native wildflowers should be dropped from this Prohibited list. I fully agree with this recommendation - the native prairie plants on the list grow in abundance in Canada, are a part of our natural ecosystem, and restricting their seed doesn't make much sense. I do agree that seed for the non-native, foreign species on this list should remain prohibited.
Seeds with a * I have seen listed in either
or American seed catalogues,
so be careful you avoid importing them.
1. Astragalus bisulcatus Two-grooved milk vetch 2. Astragalus decumbens * Timber milk-vetch 3. Astragalus pectinatus * Narrow-leaved milk-vetch 4. Cardaria spp. Hoary cress 5. Carduus nutans * Nodding thistle 6. Centaurea diffusa Diffuse knapweed 7. Centaurea maculosa Spotted knapweed 8. Centaurea repens Russian knapweed 9. Centaurea solstitialis * Yellow starthistle 10. Cicuta douglasii Western water hemlock 11. Conium maculatum * Poison hemlock 12. Convolvulus arvensis Field bindweed 13. Crupina vulgaris Common crupina 14. Cuscuta spp. Dodder 15. Datura stramonium * Jimsonweed 16. Delphinium bicolor * Low larkspur 17. Delphinium glaucum * Tall larkspur 18. Euphorbia esula Leafy spurge 19. Halogeton glomeratus Halogeton 20. Lupinus argenteus * Silvery lupine 21. Odontites serontina Red bartsia 22. Oxytropis campestris
(syn. Oxytropis macounii)
Early yellow locoweed 23. Sarcobatus vermiculatus Greasewood 24. Senecio jacobaea * Tansy ragwort 25. Solanum carolinense Horse nettle (Bull nettle) 26. Thermopsis rhombifolia * Golden-bean 27. Triglochin maritima * Seaside arrow grass 28. Zigadenus elegans *
(syn. Zygadenus elegans)
White camas (Smooth Camas) 29. Zigadenus venenosus *
(syn. Zygadenus gramineus)
I have seen seed for a couple of plants listed in the Saskatchewan Noxious Weeds Act available for sale in American and European seed catalogues. Do our native habitat a favour, and avoid growing these:
1. Linaria vulgaris * Toadflax 2. Lythrum salicaria * Purple Loosestrife
Delphinium bicolor (Low Larkspur), number 16 on the list above