Dr. Jackson. June 2, 2021. Williamston, Michigan, United States.. I live in USDA Zone 5b. My shrub is about 7 feet high by 7 feet wide, there is only tip dieback during the winter. I believe this size can be attributed to having a south facing and west facing wall on two sides, and an asphalt driveway and concrete walkway on the other two sides. I think this helps protect it during winter nights when the temperatures drop into the negative teens Fahrenheit.
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Dr. Jackson. June 2, 2021. Williamston, Michigan, United States..
I live in USDA Zone 5b. My shrub is about 7 feet high by 7 feet wide, there is only tip dieback during the winter. I believe this size can be attributed to having a south facing and west facing wall on two sides, and an asphalt driveway and concrete walkway on the other two sides. I think this helps protect it during winter nights when the temperatures drop into the negative teens Fahrenheit.