Pomegranates have relatively low water requirements, and can survive drought conditions for several years (although during that time, the harvest will be smaller). Too much or uneven amounts of water, either from irregular or over irrigating, heavy summer rains, or high humidity, can result in fruit cracking, decreased fruit production, and other problems. It is not necessary to prune your pomegranate trees, but it can help with ease of harvest, better fruit, and for a shapelier tree.