This section is from the book "The Gardener's Monthly And Horticulturist V23", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
The enclosed specimens were found by Mr. Edward Little in a copse about a mile from Tunbridge in Kent, growing in a patch by themselves amongst a a large number of those of the usual color. He failed to find any difference in soil, aspect, or proximity of any peculiar plant, the manure from the decayed leaves of which might have occasioned this marked change of color. W. T. T. [We never saw blue flowers of Anemone nemo-rosa before. They are nearly as blue as those of A. apenina. Eds.]
The above is from the Gardener's Chronicle. As this is the common "wind-flower" of American woods, a blue variety might be found here also, by looking sharply. Pinkish ones are not uncommon.