I am so glad I decided to read this post. Not that I can help you, but I was very disappointed that my hardy Sheffield Pink did not return and I was wondering why. Now I know it's not anything I did and that others are in the 'same boat'. This weather is doing such strange things: neither my Sheffield Pink nor my Buddleias survived,but yesterday I realized that my Gaillardia, not usually hardy this far north is back!! Go figure. Hope you find some help with your search.

Hi, I did a post awhile back looking for Morden Mums. They are grown out west and can be shipped here but the shipping costs would be extremely expensive. I did try emailing some of the major nurseries with not much luck either.

I did find some Korean mum seeds at Thompson & Morgan. I'm growing those to see how they fare. Still extremely tiny and I'm growing them gingerly in pots until they are big enough to be transplanted in the fall (hopefully) or they will come inside for the winter for spring planting next year.

Article on Korean Mums - http://www.westonnurseries.com/index.cfm?fuseaction=articles.detail&articleID=34

Here is a link that might be useful: T&M Korean Fanfare Mums Hardy z 4-9

I think you will have a difficult time sourcing quality Canadian hardy mums at the ubiquitous Sheridan Nursery or at most any other nursery. Having said that this smaller independent Ontario nursery does list several quality Canadian hardy mums:

Here is a link that might be useful: hardy mums in Ontario