Mum's the word: the chrysanthemum breeding program at U. of Minnesota
The chrysanthemums breeding program at the University of Minnesota is one of the oldest public sector breeding programs in the world, and the only one in North America. One of their experiment stations for mums is located in Grand Rapids, Minn., and is a definite zone 3. Beginning in the 1920s, the U of M researchers began selecting and breeding mums for early flowering. At that time there were no mums that bloomed before Minnesota's killing frosts.
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