Answer: Norfolk Island Pine (Araucaria) grows outdoors in warm-winter regions, but won't survive your winter climate outdoors. The trees can grow to 100' under optimal conditions, but generally peak out at about 5 feet when grown in a container. So, the good new is that your tree has probably reached its mature height. Since Norfolk Island Pines are generally slow growing, you can keep them on the small side by keeping them pot-bound. The bottom line is you'll have to protect your tree from winter weather if you want it to survive.
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