Answer: Chamaecyparis obtusa 'Coralliformis' is Hinoki cypress and is hardy in zones 4 to 8. Your hardiness zone, according to your zip code, is USDA zone 5. The general rule of thumb is: If your container plants are rated hardy to zones one or two points less than your area, then they should survive being left outdoors with minimal protection for the winter. Given your zone and the tree's hardiness rating, it should winter over in a container without additional protection.
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