Japanese lilac tree

Question

The bark is splitting.

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Answer 1

Splitting bark on a Japanese lilac tree can be caused by rapidly changing temperatures, especially when freeze-thaw cycles occur in winter, or rapidly changing water conditions, like a drought followed by heavy rains. Fortunately, the tree will probably be fine. Here is more information about this problem:

https://www.gardeningknowhow.com/ornamental/shrubs/lilac/lilac-bark-coming-off.htm