Lordbrady: Some varieties of nectarines have a tendency toward split pits. The degree may be affected by environmental or other factors. But there is not much you can do about it. Some of my nectarines in my greenhouse have the wrinkled skin you report as though they were dehydrated. I don't know what causes this either. The trees appear to have enough water.

Nectarines are just hard to grow. But they sure can be worth the trouble and frequent disappointment. My best fruit this yr has been the nectarines. Even though some of them have been a mess.

The Fruitnut

I have an Avalon Pride peach that has had lots of split pits this year. It really doesn't bother me too much, although it can look awful. And if the pit splits enough it will make an opening at the stem and earwigs will inevitably move in. Even when that happens, the peaches are still yummy for fresh eating, but I keep those away from my wife, I don't want to discourage her from eating our fresh-grown fruit. If she sees an earwig crawl out then it's all over.

I should say so 😳😳

Whatta bump!