To propagate Japanese Aralia (Fatsia japonica), you can take stem cuttings in late summer, dip the cut end in rooting hormone, and plant them in a pot with well-draining soil, keeping the soil moist and the humidity high. You can also propagate from seed, but cuttings are more reliable for maintaining specific cultivars.
Here’s a more detailed guide:
1. Stem Cuttings:
- Timing: Take cuttings in late summer.
- Selection: Choose healthy, semi-ripe stems with a few leaves.
- Cutting: Cut just below a node (where leaves emerge). Remove lower leaves to expose the stem.
- Rooting Hormone: Dip the cut end in rooting hormone (optional but recommended).
- Planting: Place the cutting in a pot with well-draining potting mix. Ensure the base is covered with soil and lightly tamp it down.
- Care: Keep the soil consistently moist. Maintain high humidity (use a humidity dome or plastic wrap). Roots can take several weeks to develop, so be patient.
2. Seed Propagation:
- Seed Collection: Collect seeds from the ripe black berries in late fall or early winter.
- Seed Extraction: Soak and crush the berries to extract the seeds.
- Sowing: Plant seeds in rich potting soil. Use a warming mat to maintain a temperature of around 80°F (27°C). Cover the pots with plastic wrap to maintain humidity.
- Germination: Expect germination in 2 to 8 weeks.
- After Germination: Remove the plastic wrap once seedlings emerge. Gradually acclimate seedlings to less warm and humid conditions.
Tips for Success:
- Warmth: Fatsia japonica seeds and cuttings thrive in warm, humid conditions.
- Light: Provide bright, indirect light.
- Watering: Keep the soil consistently moist but not soggy.
- Patience: Propagation can take time, so be patient and don’t give up.