Rooting a Lilac Cutting from a Memorial Tree: Challenges & Protocol

Your 11-inch Japanese tree lilac (Syringa reticulata 'Ivory Silk') branch has sentimental value—but its size and maturity make rooting difficult.

The Problem

• Too large: Viable cuttings are 4–6 inches (10–15 cm), pencil-thick (≤1 cm). Your ½-inch, 11-inch piece is over-mature.
• Forced blooms: Energy spent flowering depletes reserves needed for rooting.
• Time detached: Every hour out of water reduces viability.

If You Try Anyway

1. Cut into 6-inch sections. Remove all flowers and leaves except top 2.
2. Dip base in rooting hormone (IBA 0.3–0.8%).
3. Stick 1 inch deep in wet sand/perlite. Seal in clear plastic bag.
4. Keep at 75–85°F (24–29°C) with bottom heat. Bright indirect light.
5. Check at 6–8 weeks. Success is unlikely but possible if buds were just greening.

Better Ways to Preserve the Legacy

• Layering: Bend a low branch to ground, wound it, pin down, cover with soil. Roots in 1 year. Sever and transplant.
• Suckers: Lilacs often send up root suckers. Dig one with roots in early spring.
• Buy a new 'Ivory Silk' and plant it nearby—a living companion to the original.

Your daughter's memory deserves a thriving tree. Layering or a new grafted tree offers the best chance.