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

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
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