I'm in zone 5 and overwinter, Bay, Rosemary,Lemon Grass, and Mexican Oregano. I grow them in pots and just move them outside in the spring and back inside in the fall.They seem to do fine for me. The Columnar Basil, though a perennial,tends to get woody main stems over time and I do better rooting cuttings ( they root very easily and grow quickly) and replacing the older plants with newer.
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