Answer: It is somewhat risky to plant perennials in large pots and hope they come back each year because the roots in the pots are exposed to colder temperatures than they would be when insulated in the soil underground. However, I have had luck with very tough and sturdy plants such as thyme, dianthus, hosta, violas and sedums left out over the winter. You might experiment and see what works well for you. Alternatively, you could plant nearly anything you like and then transplant your selections to the ground over the winter and replant them in pots in the spring. Yet another option is to plant something very special such as a tree rose or rosemary topiary and plan on sheltering it under cover over the winter.
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