This section is from the book "The Gardener's Monthly And Horticulturist V21", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
J. A. McK., Cynthiana, Ky., says : "Observation for twenty-five years leads me to believe that 12° below zero of still air kills all the peach buds; that 18° injures young trees in a low situation, and 22° kills all peach trees. Am I right, or will buds and trees, under favorable circumstances, resist greater cold ? I wish at your leisure you would give us through our monthly "visitor and friend," what is definitely known on this subject, also about what degree of cold kills flower and fruit buds of other plants in common cultivation over the country".
[The degree of cold, by itself, has nothing to do with the destruction of trees or buds. A tree will retain its heat, which is its life, under a very low temperature sometimes, and yet die at others under a higher one. For instance the Eucalyptus globulus has been known to endure a temperature of 12° to 15° below freezing point in England without injury, while in any of the Northern States of the American Union it is killed "dead at once" by a single degree of frost. So of many other things. - Ed. G. M].