Answer: I have a Meyer lemon that I baby along, too. It's indoors in winter and out in the spring and summer. The leaves of your tree are getting sunburned and while it won't harm the plant, it doesn't look very nice. The reason for this is the leaves were accustomed to lower light levels while indoors. Direct sunlight is just too intensive for the leaves. You can try providing only morning sun, which is not as intense as afternoon sun, or try setting it where it gets bright light but not direct sunshine. Your tree will be happiest if you can somehow keep the soil moist but not soggy wet. If the appearance doesn't bother you, you can try upending a bottle of drinking water in the potting soil. Set it so the shoulders are in the soil. As the soil begins to dry out the water will be drawn out of the bottle and into the soil. This will ensure there's a continuous supply of water - but not too much. I do this when I go on vacation but you could do the same thing year 'round. It might be worth a try. Best wishes with your lemon tree.
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