Please tell me how to get my Thundercloud Plum trees to get more leaves. I have tried fertilizer sticks, spraying for bugs and I am at a lost.

Fertilizing the Thundercloud Plum Trees in the spring will encourage new growth. If the trees were recently transplanted, less than 1 year ago, there is little cause for concern as it generally takes 2 years for newly transplanted trees to begin putting on significant growth. The main concern is that these trees need full sun to promote a lot of growth. A tree will only make the leaves it needs to make food. If there is not enough sun then there will be fewer leaves, as compared to a tree that was planted with more sun exposure. Full sun being at least 6 hours of sun a day.