Hoyas can be multiplied through stem cuttings, layering, and division of the plant. 1. Stem cuttings: Cut a healthy stem from the mother plant, ensuring that it has at least two nodes (where leaves grow from). Remove the lower leaves and dip the cut end in rooting hormone. Plant the cutting in a well-draining soil mix and water regularly. 2. Layering: Bend a healthy stem from the mother plant down to the soil surface, and secure it in place with a U-shaped wire. Make a small cut in the stem where it contacts the soil, and dust with rooting hormone. Cover the cut with soil and water regularly. Once roots have formed, cut the new plant free from the mother plant. 3. Division: When the mother plant has become large and overcrowded, it can be divided into smaller sections. Gently remove the plant from its pot and separate the root mass into smaller sections, each with its own stem and leaves. Replant each section in its own pot with fresh soil.