Answer: The main danger to container plants is that the roots will freeze. You will need to insulate the soil somehow. One way is to sink the container in the ground, another is to heap mulch around it, another is to wrap in insulating materials as best you can. Also make sure that the soil is kept moist, but not sopping wet, until it freezes. The strawberries themselves should only be covered with a fluffy type of mulch such as pine needles, straw, or possibly non-packing leaves such as chopped oak leaves. The raised deck will be cold from underneath, so if you are able to set the container on the ground under the deck that would be better. You may have to experiment, too, and see what works best for you in this location. Good luck with your strawberries!
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