Answer: Leaf drop is a common condition with citrus trees. It is also common when plants have been outside during moderate weather and then are brought indoors for the winter. The sudden change in conditions is a "shock" to the plant and a typical response is for it to drop leaves. Keep your tree in as bright a location as possible, but away from drafts, heating vents, etc. Water slowly and deeply so water runs out the drainage holes, to completely saturate the soil and leach away salts. Fertilize monthly with a citrus fertilizer (if you can find one), or a balanced fertilizer, such as 10-10-10. I use a half-strength dilution of liquid houseplant fertilizer (Shultz's or Peter's). Your tree may not seem vigorous indoors during the winter, but it should perk up again next year when you take it outdoors. Note that citrus are extremely frost tender, so don't put it outdoors too soon! (Or, put it out during the day but bring it in at night.) Also, it's a good idea to acclimate any plant to a sudden change in conditions, moving it in stages. Hope this info helps!
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