Answer: The types of perennials you're growing and your gardening zone will dictate the protective measures you may have to take. Some perennials are extremely hardy and will overwinter in the containers without problem - others will need protection from extreme temperatures. All plants in pots are susceptible to frozen roots during the winter months and the best way to avoid that is to simply bury the pots in the garden. Garden soil will help insulate the roots. Or, if the containers are large and difficult to move, you can set each on a slab of styrofoam insulation and wrap insulation around each pot. Hope this information helps you make informed decisions about protecting your perennials.
Best wishes with your container garden!
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