Thornless Blackberry Zones - Knowledgebase Question

Menomonie, WI
Avatar for lfremouw
Question by lfremouw
March 20, 2000
Will thornless blackberry plants thrive in my zone.? I've been told I live in zone 4. Winters haven't been harsh here in Western Wisconsin in recent years.

Answer from NGA
March 20, 2000
Thornless blackberries are more sensitive to cold than their thorny cousins and are generally safe to about 0 degrees F. Thornless blackberries are vigorous, erect or semi-erect plants and should be spaced 4-6 feet apart in a row to allow sunlight to penetrate the entire plant. Most cultivars are hardy in zones 5 or 6. You can certainly try growing one of the most hardy cultivars in your garden to see how it fares. 'Chester' fruits late in the season but provides very large, very sweet berries. It's hardy to -10F.

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