Water the tree deeply and frequently during fall and half the amount of irrigation in winter. Resume the deep watering in spring and summer as these juicy fruits need plenty of moisture to form. Fertilize in spring with an appropriate food, including the addition of phosphorus to encourage blooming and fruiting, and prune only where necessary. Fruits set on the ends of branches, so it is best to remove only dead wood and problem branches. Protect the tree from disease and insects and take appropriate steps at the first sign of trouble. Healthy plants produce the most fruit. If the lemon tree is still not producing fruits, it might be due to a poor rootstock. Dwarf stocks produce the best fruit and will bear more quickly than full-sized trees. You can always wait a year after good cultivation and see if fruit comes the second year. This is especially true if you have neglected lemon trees. They may just need a little TLC for a year and they will reward you with a bumper crop of golden lemons.