This section is from the book "The Gardener's Monthly And Horticulturist V22", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
F. K., St. Louis, Mo., writes: " We have here an abundance of a white flowered weed which is one of the worst of our wild things. But when talking with a friend recently about it, I was corrected. He said it was not a wild flower, but an exotic. I am sure it is native to these parts, for I have known it long years ago. What is the true meaning of exotic as applied to a common weed?"
[Usually, gardeners confine the term exotic to plants requiring more than usual garden care brought from other countries; they would scarcely call a weed which came to this country without his direct aid an exotic. Still, critically, one might call an introduced weed an exotic. Usually foreign weeds would be called introduced, and only those that have been here before the white man came would be called indigenous or native. As a matter of fact there is nothing to show that any plant is "native," in the sense that it is now in the locality where it was first created. Plants are great wanderers. They are ever on the move. We call plants native just as we call Indians natives, simply because they were here when our history began. A foreign or introduced flower, would be one that has been known to come here since our time. It is scarcely worth arguing whether a plant is indigenous or exotic. When it once makes a home here, it should be regarded as a native. - Ed].