Answer: If your plant looks otherwise healthy, I wouldn't worry about a few yellowing leaves. It is natural for plants to drop some leaves to make room for new growth. Yellow leaves can be caused by many things including lack of nitrogen, insufficient light, water-logged soil (plant roots need oxygen to thrive), dry soil, iron deficiency or transplant shock. If the older bottom leaves are yellow, but new growth is green, it's usually a lack of nitrogen. If new leaves are yellow, with green veins, it's usually a lack of iron. Soil should be kept moderately moist (but not wet). Finally, transplant shock can contribute to yellowing. Try to isolate each of these possibilities one at a time, but again, if it's not many leaves and everything else appears healthy, I wouldn't worry about it!
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