Can I leave my very large Gardenia bush outside near the house (heat) if I prune and cover w/burlap?
Gardenia Bush and Winter
Certified GKH Gardening Expert
For plants in pots, they actually suffer conditions that are one zone lower than your current zone due to their exposed conditions. This would not work for a gardenia in NJ. You may be able to store the gardenia inside, in the basement or someplace like that with a bright flourecent light to get it through the winter. It won't thrive like this, but may survive until the spring when it can go back outside.