Propagating Euphorbia tirucalli (Pencil Tree) from Cuttings

Successful Propagation of the Pencil Tree

Euphorbia tirucalli, known as pencil tree, milkbush, or pencil euphorbia, is a striking succulent that roots readily from cuttings when handled correctly. Here's a step-by-step guide based on proven techniques.

Timing and Cutting Selection

• Best time: Spring, after April 1st, when days are longer and the plant is in active growth.
• Cutting type: Use semi-mature tip cuttings, 6–10 inches long. Avoid very old, woody growth or tender new shoots.
• Preparation: Rinse the cut end with water to stop the milky latex flow, then let the cutting dry (callus) for 3–4 days—not two weeks—in a shaded, airy spot.

Rooting Medium and Environment

• Medium: Slightly moist coarse sand or a sand-perlite mix provides excellent drainage and aeration.
• No misting: Treat like a cactus—do not mist. High humidity encourages rot.
• Light: Bright indirect light or 12–14 hours of fluorescent light kept 12 inches above cuttings. If natural daylight exceeds 14 hours, supplemental light isn't needed.
• Temperature: Warmth (70–75°F) speeds rooting.

Rooting Hormone: Optional but Worth Testing

Rooting hormone isn't required, but you can experiment by treating some cuttings and leaving others untreated to compare results. Many growers find it speeds root initiation.

Aftercare

Once rooted (typically 4–6 weeks), transplant into a well-draining cactus/succulent mix. Water sparingly until established. Remember: all parts of Euphorbia tirucalli are toxic and the sap is a severe irritant—wear gloves and eye protection.