Answer: Most blueberries are hardy only to zone 3, but you can try the following:
North Country ? Short in stature, plant maturing at 20" high. Fruits are small and flavorful, good for home gardener use. This cultivar is an outstanding ornamental with profuse flowering and brilliant fall colors. Grown successfully in zones 3-8.
Northland ?The flavor of the fruits are mostly sweet from the 1st to the last fruits. We like the plant because it grows in any soil type and is virtually indestructible in any environment. The production is consistently high in recommended zones. Plants grow to 4 feet high. Grown successfully in zones 3-7.
North Sky ? The plant is a very nice ornamental with excellent fall colors. The fruits are small and full of wild type sweet flavor. The spreading growth will grow to a height of 20 inches at maturity. The plants grow in most soil types. Grown successfully in zones 3-7.
For best results, blueberries need a growing season of 140 days Even when low winter temperatures kill the tops of plants, the crown and roots are protected by the snow cover and they put out new shoots that bear fruit the following year. Where deep snows prevail, much of the bush is protected from extreme low temperatures; heavy snows, however, can cause damage.
An early fall frost sometimes kills back late-growing shoots from the tip, but in most cases this injury can be pruned away. A late spring frost, on the other hand, can injure partly opened flowers, causing a partial to total crop loss on some early-flowering cultivars. These early cultivars are not recommended for areas that typically receive late spring frosts.
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