Basic care instructions for a dwarf Korean lilac tree include planting it during the early spring in rich, well-drained soil. Choose a location that gets full sun for at least six hours a day.
Fertilize a dwarf Korean lilac tree after planting it and then annually in the spring. Water these trees regularly during their first year, until they become established. Afterwards, water them only in the summer. Prune these trees after they first flower in May or June to stimulate further blooming. Dwarf Korean lilac trees do not need special care because they are hardy and not susceptible to powerdy mildew like other varieties of lilac.