Answer: Your tree is old enough to set fruit so it should flower. You didn't mention whether or not it produces flowers. If not, you're either accidentally pruning them off, or the growing conditions are not quite right. All types of citrus make wonderful indoor plants, and while they can be quite finicky about flowering and fruiting, their fragrance makes them worth the effort. To encourage flowering, keep your plant where temperatures remain between 50 and 60 degrees at night, fertilize once a month, alternating between a 20-20-20 and a high-phosphorus fertilizer, and maintain about 50 percent humidity around the plant. Since you can move your plant outdoors in the spring and summer, the bees can help with pollinating the flowers.
Hope you have a bountiful harvest!
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