Sap Freezing

Frozen sap of red oak, 10 Feb 2019 (photo by Kate St. John)

The weather this month has been up and down like a yo-yo: A low of 6oF on February 2, highs in the 50s and 60s for six days, then a low of 14oF on February 9. During those warm days the sap started running in the trees. I wouldn’t have noticed except …

On February 10 during a walk in Schenley Park I found flash-frozen sap on the damaged trees. At top, a fallen red oak made a red-orange waterfall. Below, a small amount of sap in a fungi-encrusted tree dripped like orange ribbons.

Sap runs and freezes inside healthy trees, too. We just can’t see it.

(photos by Kate St. John)

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