Answer: When any plant is brought indoors it can be a shock to the system since conditions in our homes are generally not as "perfect" as at the grower's. Dropping leaves is a typical reaction to this, and citrus are often prone to leaf drop, even when grown outdoors, when temperature conditions change. Your lemon tree will adapt to its growing conditions eventually and will put out new growth. In the meantime it will look pathetic. Don't give up on it - continue to water and mist on a regular schedule. I suspect it will replace the lost leaves, flower and produce fruit for you. Best wishes with your tree!
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