Brown Edges on Leaves

Question

I have a long-established Malus ‘John Downie’ and a Prunus amanogawa. They both start growing vigorously in the spring, but the leaf edges turn bright brown, the shoots become distorted so that, although established, they have made very little growth. The soil is clay and heavily top-dressed each year. Thinking it might be water logging, I moved both a few years ago to slightly raised beds, but no difference. Other trees, shrubs, etc. are thriving.

Answer 1

This article will help:
https://www.gardeningknowhow.com/plant-problems/environmental/what-causes-brown-edges-on-leaves-of-plant.htm