The reason for leaf cracking on Paulownea tomentosum
A young plant due to be planted outside.
Certified GKH Gardening Expert
It will be hard to say without seeing a photo of the damage. It could be a variety of issues. Please include one, and I will be more than glad to help.
In the meantime, this article will help you to care for these trees: https://www.gardeningknowhow.com/ornamental/trees/royal-empress/worlds-fastest-growing-shade-tree.htm