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Protecting young trees from extreme cold

 
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Location: Penticton, Canada
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We have a cold front coming through here in the Okanagan, where usually our lowest minimum is around -18C, we are forecast to be down around -26c for two nights next week.
What would you recommend in terms of protecting young trees?
 
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Location: Northern WI (zone 4)
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One tip I got from a nursery guy north of me is to cover them at night to keep them from losing radiant heat to the night sky on frigid clear nights.  Just a thin sheet or something does the trick. It's not for insulation, it's to block the sight line to the sky.
 
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Location: Cache Valley, zone 4b, Irrigated, 9" rain in badlands.
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I take a hands off approach to frost. My basic attitude is that if cold is going to kill a tree, then it might be better if that tree isn't taking up space on my farm.

 
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