Transplanted Olive tree trunk split
I live in Morocco and have transplanted about 80 olive trees in December, they were in the ground and were about 6 years old. I noticed that many of them had a split in the trunk (see picture) 2-3 weeks later. I was wondering why they may have split, and if there is anything that can be done for these trees, or are they not going to make it .
Any help is much appreciated. Thanks