Why does every one of my "Celebrity" tomatoes have several splits in the skin? I also have planted the "Phoenix" variety and they are doing well - no splits. They are right next to each other! (I live in Phoenix, so thought I'd try them as they are supposed to be heat resistant.) So far so good with them. Won't be fully ripe for a couple of days so I don't know how they will taste, but they are big! Thanks for any help you can give.