Lemon tree care and upkeep question?

If you have a lemon tree with fruit that hasn't ripened in a long time, maybe it's a lime tree. As for care, these trees are very hardy and as long as they have plenty of sun they do well. Occasional fertilization is always a good idea but not a must do. Nurseries can give you advice on fertilizer. They will also know what is best for your area and type of soil you already have. Occasional water is best and prune only if it gets too big.