Answer: I think the timing of your vacation is coincidental with the leaf drop on your lime tree. Citrus trees can summer outdoors in Oregon but need to be indoors in the wintertime. It can be stressful for a citrus tree to make the adjustment from being outdoors in full sunshine to being indoors in less intense light. Indoor air is often drier than outdoor air, and nighttime temperatures can be warmer than your tree experienced outdoors. I think your tree will adjust - give it bright, indirect sunshine; enough water to keep the soil moist but not soggy wet; keep it out of drafts; and mist it daily to compensate for dry indoor air. It should replace the lost foliage in a few weeks. Hope it hangs on to the fruit!
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