Locate the center and main root system of a mature vinca plant. Locate secondary plants around the base of the main plant by looking for emerging growth.
Sever the stem attaching the newly rooted vinca to the main plant using pruning shears. Cut the connecting stem close to ground level.
Untangle the stems emerging from the new root system. Trim the stems to a 6-inch length using pruning shears.
Measure out a 4-inch radius around the base of the vinca plant. Dig down to a depth of 5 inches using a garden trowel. Lift the vinca transplant from the ground with the soil beneath it intact.
Pot the vinca transplant in a 6-inch planting container filled with 4 parts potting soil and 1 part coarse sand or plant it directly in the ground 4 feet from the mother plant. Transplant the vinca with the base of the stems at ground level.
Water the vinca to a depth of 3 inches immediately after transplant. Water one more time one week later.
Keep potted vinca transplants in their growing containers for two to three months or until they put on significant growth, before planting them in the ground.