Q.Why my plum tree is not shedding leaves?
I planted my plum tree back in June 2018. We all know that during winter plum trees shed their leaves and go dormant, but my planted plum tree did not show any of the signs of shedding off its leaves. Why it happened, and is this a sign that my tree may be faulty or something?

Certified GKH Gardening Expert
Your country doesn't seem to get cold enough for any of the prunus species to drop leaves. In fact, most of the species could very well fail to fruit in your country, since it lacks a time where the temperatures spend several months below freezing. There are only a few species of plum that will do well, and only a handful of nectarines, so you will have to make sure that what you have is bred for your area. If you plant from seed, then you won't likely get your target fruit, since they willingly cross pollinate.
I would say that your tree is perfectly fine, and is reacting as it should given the environment.
https://www.gardeningknowhow.com/edible/fruits/plum/growing-plum-trees.htm
https://www.gardeningknowhow.com/edible/fruits/plum/plum-trees-not-fruiting.htm