i'm fairly sure that the possession of cannabis seeds in canada isn't illegal like it is in the us.. same as in the uk, ok to possess the seeds so long as you don't try and germ them is how i think it goes for canada..
even still, i live in the us, and the worst that happens is they take your beans at customs and you get a lovely letter saying someone tried to mail you some contraband..
there are also seed banks in canada that you could order from, that way you'd not have to worry about any form of customs or what ever it would be called in canada..