Answer: It doesn't sound as though your tree is thriving as it should. Here are some basic guidelines for growing indoor lemon trees: Citrus like lots of water, but yellowing leaves is often a sign of overwatering. Sometimes sitting in a draft will cause leaves to yellow and fall. Be patient and fertilizer lightly with a balanced citrus food.
In general, keep temperatures between 50F and 60F at night, maintain humidity at 50% and fertilize monthly with a 20-20-20. Also, Myers and other dwarf lemons often suffer when they get too much direct light, so be sure yours gets filtered light during midday heat and sun.
If you're not following the above, a change should surely help your tree regain its health and perform to its full potential. Good luck with your tree!
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