Overwintering is certainly possible, Imp, even in my climate. Truth is, though, almost all mums die here in the winter, because they are not planted until the fall. But no one will buy a plant that is not blooming, so no one buys them in the early summer when they really should be planted out to have their best chance of making it through the winter. I didn't try to overwinter mine from last year, because I got thrips and whiteflies so bad that I was concerned about contracting a virus from them, which would then be propagated with cuttings from that plant. And I don't think mums propagate from seed, just cuttings. Several of them are patented varieties, meaning that rooting a cutting is technically illegal if you don't pay the patent holder a small fee for each cutting. No one is going to put you in jail for that crime, but if you were to sell a lot of them, you could be held civilly liable for three times the profit you made.
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