Answer: Like most houseplants, citrus thrive in a normal household temperature range of 70 degrees during day, to 55 to 55 degrees at night. Citrus trees prefer full sun from a southern exposure. If that's not possible, you can supplement the light by installing 40-watt fluorescent shop lights above the plant, keeping it on 14-16 hour a day. As for moisture, you'll need to keep the soil evenly moist and since most interiors are quite dry during the winter months, mist your plant often -- daily if you can. Best wishes with your lemon tree!
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