Not all, but a few pamagranates always split on the tree. Trees are young, about 3 yrs old, still small, about 5 ft. Some that split are small to large (size of a softball). Is it too much water? Too little, or just the nature of things? We live in N. California, very hot summers, they are on drip irrigation. It's mid Oct, no rain since last spring and we water daily for about 40 mins. Those that don't split are perfect, even split ones taste great. Just wondering. Thank you.