Rowan Tree

Question

Lack of leaves – what is the problem?

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Answer 1

This article might help you find the answer. The same problem can occur in late summer as well, especially in a hot and/or dry year:

http://csuhort.blogspot.com/2013/08/the-mid-summer-leaf-drop-blues_1002.html

Also check this article about rowan diseases in case yours is showing any disease symptoms. Rowan is also known as mountain ash or by its scientific name, Sorbus.

https://extension.psu.edu/pests/plant-diseases/all-fact-sheets/mountain-ash-diseases