Arborvitae is hardy outdoors in your gardening zone but because yours is in a container, the roots will be susceptible to colder temperatures than if it were planted in the ground. You can dig a hole and sink the pot into the hole for the winter months. The earth will insulate the roots. In the spring you can unearth the pot and either enjoy it as a container plant or plant it in a permanent site in your landscape. Enjoy your garden!
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