Answer: The only quick and easy solution for getting rid of fire ants in the soil of your Dracaena is to unpot the plant, hose the soil off the roots and wash the pot out, then repot with fresh potting soil. The chemicals that kill fire ants will also harm your plant. Wish there were an easier solution, but repotting with fresh soil is the best approach. You wouldn't want any hitchhikers in the soil when you take your plant indoors!
A banana tree should be hardy in your growing region. If the weather gets cold enough to kill the tops of the plant, cut them away in the early spring and the roots will send up new stems.
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