Stratifying Japanese Maple Seeds: Fridge Method for Germination

Proper Cold Stratification for Acer palmatum

Freezing seeds kills them. True stratification mimics winter in a refrigerator (34–40°F), not a freezer.

Step-by-Step Protocol

1. Soak seeds 48 hours in lukewarm water.
2. Mix with damp (not wet) sphagnum moss or peat in a zipper bag.
3. Hold at room temperature 4–6 weeks (warm stratification).
4. Refrigerate 60–90 days (cold stratification).
5. Sow ¼ inch deep in seed compost at 65–70°F.
6. Use a propagator or warm spot for consistent heat.
7. Transplant seedlings to 2–3 inch pots when handleable.

Germination is sporadic; patience yields results.