The process of transplanting a Newport plum tree involves digging out the root ball and digging a new hole, which are both labor intensive. Provide special care for the first two weeks after transplant.
Wait until the best time to transplant
Prevent transplant shock by moving the tree when it'd deep in its dormant state. If this isn't possible, move it just after the leaves drop. Transplant the tree during its first five-years for best results.
Remove the tree from its location
Dig out the roots of the tree. Plums have a shallow but wide root mass. Keep the dirt on the roots and avoid cutting the roots as much as possible.
Prepare the new location
Dig the new hole, the same depth as the root mass and a minimum of three-times its size. Mix compost into the soil removed from the hole before replanting.
Plant the tree
Place the tree in the hole. Add the soil mix back into the hole around the roots. Stop and add water several times to help compact the soil mix.
Provide post-transplant care
Water the tree daily for the first two weeks after transplanting. Place pine needle mulch around the base of the tree to retain water. Maintain this mulch for the first five years after transplanting to reduce the competition of grass for water and nutrients.