I noticed they are only hardy to zone 5 and from what I hear they exaggerate on the zones. Also the flowers are sterile. The funny thing is that I cannot find one place where it has over-wintered, all comments about this plant seem to be negative about overwintering, even people in zone 8 and 9 can not get them to over winter. If you really like the plant, just buy it cheep and treat it like an annual. 
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