Answer: Citrus requires full sun and warm temperatures to thrive. That's why citrus crops are grown in Arizona, California and Florida. Being moved indoors would have been a shock, and dropping leaves is a common response when a plant is stressed. Citrus in the landscape generally requires alot of nitrogen, but since yours is in a pot, the 20-20-20 should be fine. If the bark tissue was green when you scratched it, it is still viable. It's very likely that the tree will perk up again when moved back outside. I would not prune it because often what looks "dead" can sprout new growth, and you may prune off something that doesn't need to be pruned. As a general rule, it's better not to prune citrus, unless a branch is dead or diseased, or you have a space problem since yours moves indoors. Citrus in the orchards are not pruned! Finally, citrus are very moisture dependent, so make sure soil stays moist, but not wet. Water when the top inch or so dries out. Good luck!
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