How do you start a lilac tree from a branch?

To start a lilac tree from a branch, you can take a cutting from a healthy lilac tree in the spring. Choose a branch that is about 6-8 inches long and has several leaf nodes. Remove the lower leaves and dip the cut end in rooting hormone. Plant the cutting in a pot with well-draining soil and keep it in a warm, humid environment. Water regularly and wait for roots to develop before transplanting it into the ground.