Answer: It sounds as though your little lemon tree is suffering from the stress of being taken from ideal growing conditions at the nursery to a garden show where the light is dim and the soil may have become too dry. Since you don't know whether the plant was left on the loading dock for an extended period of time and got chilled, or was given enough light and water in transit, it's hard to pinpoint the exact cause of the leaf drop. New little buds on the stems are a good sign. At this point, provide bright light (but not direct sunlight), keep the soil moist but not soggy wet, and withhold fertilizer until your tree develops new foliage. It will probably recover, but may not flower and set fruit until it becomes completely healthy again. Best wishes with your new little tree!
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