Pomegranate trees (Punica granatum) thrive in areas with cool winters, hot summers and arid climates. Humidity and temperatures below 12 degrees Fahrenheit may injure the tree. In its natural state, the pomegranate grows as a shrub. It is, however, easy to train to grow as a tree. The pomegranate tree, because it is drought-tolerant and generally disease- and pest-resistant, is easy to grow and is hardy to USDA zones 7 to 10.
Surround the pomegranate tree with a 3-inch layer of mulch, starting 2 inches away from the base of the tree and spreading to 1 foot past the dripline.
Water the pomegranate tree every two to four weeks, depending on the weather. During hot, dry periods, water more often. Water slowly and deeply. A soaker hose set to run for three to four hours is sufficient.
Fertilize the mature pomegranate tree in fall with 1/2 to 1 lb. of actual nitrogen. Sprinkle the fertilizer on the soil beneath the tree, spread it out 1 foot past the dripline, and lightly rake it into the top inch of soil. Water the area to activate the fertilizer.
Remove suckers (small shoots that grow from the base of the tree) in summer. This will allow you to grow a single-trunk tree. If you wish to grow a multiple-trunk tree, allow five or six of the strongest suckers to remain and remove the rest.
Prune the pomegranate tree annually while it is dormant. Remove branches that cross over others and those that are crowded together. Remove any dead or weak limbs by cutting them back to a main branch.