Master Gardener: Tips to grow better citrus

Q: We have a navel orange tree in our backyard. It was there when we moved in over 25 years ago. It always produces fruit with great flavor but some years, like this year, the fruit was small. Some years they are almost as big as grapefruit. Is this a water issue or a fertilizer issue? We have never done a lot of fertilizing, but I would if you recommend it.
A: Citrus trees are well-adapted to southern California’s hot summers and mild winters and are usually easy to grow here. If you want