Most of our citruses are doing well this winter except three, a lemon tree, a navel orange tree and a pummelo tree (Citrus grandis). They are bearing fruits, but their leaves are a little bit yellowish. We decide to fertilize them a little.
In general, it is not a good time to fertilize plants in fall or in winter. Fertilizer promotes new growth. New growth could be easily killed by cold weather, which could weaken the plants’ health and cause disease.
We just added a quarter strength of liquid fertilizer to all of them. It should be enough to augment some nutrient without pushing them too much for new growth.