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Old December 16, 2015   #18
jmsieglaff's Avatar
Join Date: Jan 2014
Location: Southern WI
Posts: 2,509

While I cannot say for sure, I believe duration the ground is frozen and duration at extreme temperatures probably plays the biggest effect. Especially wind at those conditions. Here in Wisconsin, even a warm winter the chances of over wintering Rosemary is slim to none.
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