Citrus Question

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Citrus will normally "yellow" to some degree. If your problem seems worse, check for over watering by examining soil and root condition. Adjust your watering if needed. If soil is normal and roots healthy, try a good high nitrogen citrus/ avocado fertilizer.
Last minute thought- did you "fluff up" the existing root ball and plant into a mix soil, or "straight pot plant"? If you did the latter, root rot from overwatering may be happening, reduce watering to see if leaves brighten up.

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