My 2yr Old Dwarf Root Rowan Tree Has Developed Leaf Curl And Emerging Flowers Are Drying And Dying Off.

Answer 1

Check your growing conditions. Rowan trees prefer acidic, well-drained soil in full sun to light shade. Also check for sucking insects on the leaves such as aphids or scale. Here is more:

https://www.gardeningknowhow.com/ornamental/trees/ash/european-mountain-ash-2.htm