Germinating Japanese Maple (Acer palmatum) Seeds: A Step-by-Step Stratification Guide

Seed Preparation

1. Soak seeds in lukewarm water for 48 hours to soften the seed coat.
2. Mix with damp (not wet) sphagnum moss or peat in a zip-lock bag.
3. Keep at room temperature for 4-6 weeks (warm stratification).

Cold Stratification

Refrigerate the bag for 60-90 days at 34-40°F (1-4°C). This mimics winter and breaks dormancy.

Sowing and Aftercare

1. Sow seeds ¼ inch deep in seed-starting mix.
2. Maintain 65-70°F (18-21°C) with high humidity (use a propagator or plastic cover).
3. Transplant seedlings to individual pots when they have true leaves.

Patience Required

Germination is often sporadic over several weeks. Don't discard the tray too soon.