It is the middle of May, and the Cottonwood trees have still not leafed out here in Fort Collins. Normally they leaf out in late March or early April. We have had record amounts of snow this spring, and the second coldest May temperature ever recorded.
Disrupting the Borg is expensive and time consuming!
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My trees are leafing out in a strange hesitant fashion this year, that I have never seen before. They seem unsure about the demise of winter.
I read a paper a few years ago regarding a relationship between tree growth and sunspots that concurred with things I have witnessed. I wish I could find that paper again, not sure why I did not save it.
My cottonwoods here in Franktown, east of Castle Rock, tried to leaf out in late April. The hard freeze (20F here) in early May killed most or all. Ground is covered with dead buds.