Sweetcrisp Blueberry Planting

I just ordered this Sweetcrisp blueberry and was wondering whether I should plant it directly in the ground or pot it for the winter? I’m not sure if it will survive as I’m in 6b/7. It’s fairly small in a 4 inch pot.

From patent information,the Sweetcrisp can survive to about 5F.
I’d replant in about a 3 gallon container of Pine bark and Peat moss.That way,if the temperature gets too cold outside,it can be brought into a somewhat warmer place,preferably below 45 degrees. Brady