Q.Re Plum Tree
My 13 year old plum tree began looking very sad last year. It had produced fruit every other year, but then every year from 2020-2022, but last year began looking sad. One branch completely died, now another is looking as if it is following. Nothing has changed that I am aware of, to cause an issue. I have started growing some veg in pots in my small garden over this time.
Certified GKH Gardening Expert
These articles should help pinpoint the problem.
https://www.gardeningknowhow.com/edible/fruits/plum/plum-tree-diseases.htm
https://www.gardeningknowhow.com/edible/fruits/plum/plum-tree-is-bleeding-sap.htm
https://www.gardeningknowhow.com/edible/fruits/plum/plum-bacterial-canker.htm
https://www.gardeningknowhow.com/edible/fruits/plum/plums-with-black-knot-disease.htm
https://www.gardeningknowhow.com/edible/fruits/plum/plum-tree-fertilizer.htm
https://www.gardeningknowhow.com/edible/fruits/plum/plum-tree-fruit-spray.htm