Answer: It sounds as though you're doing everything right when you overwinter your plants. I suspect your Australian Tree Fern is exhibiting some symptoms of stress from having been moved from outdoors to in where light, temperature and humidity are slightly different. Your plant should adjust and you'll eventually be able to prune away the damaged ferns. In the meantime, continue to water deeply when the top inch or two of soil becomes dry. Best wishes with your tropical garden!
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