During the cooler winter months, you may notice the leaves of your citrus trees looking a bit pallid. This could be an indicator of a lack of nutrients or overwatering. Check the soil around the base of the trunk to ensure that it is slightly damp and spongy, not soggy. If the soil is too wet, reduce the number of emitters on the drip irrigation around the plant. Yellowing of the leaves may also mean that your citrus isn’t getting enough nutrients from the soil. Remedy this by using a liquid iron fertilizer and by placing grass clippings or mulch near the trunk. As the grass decomposes, vital nutrients will break down into the soil and be taken up by the roots of your tree.