Please see stickys at top of page.
I have known someone to apply to send a plant across the border. It wasn't totally impossible then , but severely restricted with all kinds of things you had to do to make sure you were not taking dangerous infective things from one country to another.
So, go direct
http://www.inspection.gc.ca/plants/imports/eng/1299168480001/1299168593866 Pick up the phone and call. Sit there waiting to get through. If it's that important to you comply with all regulations and make sure you've checked them out every which way.
One thought, find a florist, greenhouse, or some other plant commercial establishment and pay them to keep your plants. Idea, check out radio talk shows near border. Someone will be answering call in questions about gardening. & that person will know who might keep your plants while you're in Canada and may know how many $ you'll have to pay to make that happen.
:S