declining hawthorns

Question

Hawthorn plants are 30 years old – a few have died – some are declining. Can anything be done to save the sick ones?

Answer 1

I don't know what the symptoms or stresses that your trees are suffering, but here are some links to refresh you on the care requirements.

https://www.gardeningknowhow.com/ornamental/trees/hawthorn/growing-hawthorn-trees.htm
https://www.gardeningknowhow.com/ornamental/trees/hawthorn/pruning-hawthorn-trees.htm