Statistics for occurrence #1 of “Northern United States” in chapter 5 of Thomas Wentworth Higginson, Irene E. Jerome., In a fair country:

..., but even in England, whence most of our floral associations and traditions come, the march of the flowers is in an endless circle, and, unlike our experience, something is always in bloom. In the Northern United States , it is said, the active growth of most plants is condensed into ten weeks, while in the mother country the full activity is maintained through sixteen. But even the English winter does not seem to ...
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