Answer: It sounds like shock. Moving plants indoors from outdoors, or from a nursery/greenhouse situation can be a real shock to their system because the conditions are usually so different. Yellowing, dropping leaves is a typical reaction. Don't fertilize for a month or so, but continue watering regularly; slowly and deeply. The plant might go dormant for a while and then new growth should appear. Citrus generally need 8-10 hours of full sun, so try to give more direct light. Citrus are also heavy users of nitrogen, so start fertilizing when your plant recovers. Try to find a fertilizer specifically for citrus. Since yours is in a container you might just want to feed lightly on a continuing basis. I use a liquid fertilizer (Miracle-Gro or Peter's) and dilute it to half-strength. I feed my citrus every 2-3 weeks with this solution and it is thriving. In the spring you'll want to take your tree outdoors. Slowly acclimate your plant to moving it outdoors for a couple of hours each day, gradually increasing the amount of time it remains outdoors until it is outside 24 hours a day. In fall you can move it back indoors by reversing the process. Best wishes with your lemon tree!
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