The first two growing seasons are the most critical for the live oak. Don't allow a tree to show stress before you start watering it.
You may believe that the next generation will be the only people who benefit from a live oak tree planted now, however, that's not really true. With proper care, a live oak will grow faster and will provide more benefits than you may think in only five years.
Fertilize and water
Fertilizer and water are the keys to whether a live oak grows as rapidly as it can. At least one major feeding in late winter or early spring is essential for this rapid growth. Apply a complete fertilizer at the rate of one and a half pounds for each year of the tree's age. A complete fertilizer is one such as 8-8-8 or 10-10-10. You should put the fertilizer in small holes under the canopy of the tree.
The second feeding should come in mid-summer and this will help young trees because under good conditions, a second spurt of growth is likely at this time. Nitrogen is especially important for this second growth stage.
Large, well-established trees should have only one application of fertilizer a year. In fact, trees which have become as large as they need to be, probably shouldn't be fertilized more than once every other year. When the tree gets large, you should be more concerned with keeping it healthy than helping it grow larger.
The first two growing seasons are the most critical for the live oak. Don't allow a tree to show stress before you start watering it. Maintain moist soil at all times.