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The potted plant is outdoors in summer (indoors in winter)
- Photo of leaves on lemon tree
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The most common is a nutrient deficiency. It looks to me like this is the problem with your tree. Do you fertilized your lemon tree? A nitrogen deficiency will cause the leaves to become yellow - especially the older leaves. Your tree should probably be fed with a good organic fertilizer like Espoma Citrus-tone. Espoma recommends feeding citrus 3 times a year; in late winter, late spring, and in the fall (Sept or October).
Yellowing leaves could also be a sign of either overwatering or under watering. Be sure to keep the soil evenly moist and water when the top 2" in the pot becomes dry.
Sometimes some leaves will turn yellow and drop when the tree is brought indoors. This is normal and is due to the abrupt change in environment.