Answer: In my experience it is very difficult to keep this tree alive in a container due to its deep but brittle and sparse root system. At the same time, your winters may be too cold for it and I am sure your winter frost line is close to if not more than three feet down. So I am not sure which would be the better way to go because neither option is that good. You might try overwintering it in the container in the garage and then plant it outside in the ground next spring. Spring is a better planting time because it allows a longer time frame for the tree to become thoroughly rooted before the cold winter sets in. Keep it outside until late fall so it goes dormant, frosts are fine but do not allow it to freeze solid. Bring it inside to a cool location such as a garage (not freezing but very cool, say no more than 40 or 45 degrees) and keep the soil just barely damp meaning not bone dry. In spring take it back outside and plant it as soon as the ground thaws and the weather begins to moderate so it can wake up naturally with the season. Be very patient waiting for it to leaf out, it is normally one of the last plants to show signs of life in the spring. Good luck with your little tree!
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