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A Fifth Performance by Verbesina virginica, Dec. 28,2007

by Bob Harms ()

Click to enlarge.
V. virginica Dec. 29, — same plants as shown for Dec. 16 and 25.

On Dec. 29, at 25° F, our V. virginica experienced its fifth day of ice formations. After the initial freeze of Dec. 16 & 17 only about half of the plants showed signs of epidermis rupturing, and even on Dec. 29 some had not yet been affected. But with each frost experience, the frost formations have moved closer to the very base of the stem. And as they moved down the form of the crystallizations had also changed, being more horizontal, elongated, often somewhat 'turbulent,' and less triangular.

A selection of pictures from Dec. 29 (click to enlarge):