Zone 5 shrubs and trees #851387

Asked September 27, 2023, 11:29 AM EDT

I have noticed that quite a few shrubs etc at the Mn Arboretum are rated as zone 5. I would like to know what techniques the Arb does to have such a good success with these plants.

Washington County Minnesota

Expert Response

The zone map is based on temperatures over a ten or more year period. Local conditions can create warmer or cooler areas inside a zone, called microclimates. Zone designations are sometimes done by the original hybridizer or grower and are based on their observations. They may not be accurate for all areas.  The arboretum is in zone 4b. See this website.
You may want to ask the arboretum staff about witer protection for specific plants. 
Linda G Tenneson, Benton County EMG & TCA Replied September 27, 2023, 11:45 AM EDT

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