If you have yellow curling leaves on your citrus plants, you are probably over watering your plant. Citrus plants should be planted in well-draining soiling so that the roots do not sit in a pool of water. If you see water pooling around your plant, replant it into better draining soil.

If your citrus plant has been sitting in water for too long, it may get root rot. Once this happens, your only chance for saving it is to take the plant out and rinse the roots in a bleach (20%) / water (80%) solution. After rinsing the roots thoroughly in this solution, rinse them with water and replant in well draining soil.