Common Name: Japanese Yam (Dioscorea nipponica) 5 Short Germination Tips: Cold Stratification – Store seeds in a moist medium at 4–10°C (39–50°F) for 4–6 weeks to break dormancy. Soaking – Soak seeds in warm water for 12–24 hours before planting to improve hydration. Light & Warmth – Sow seeds on the surface or lightly cover them; keep at 20–25°C (68–77°F) for best germination. Well-Draining Soil – Use a sandy, loamy mix with good aeration to prevent damping off. Patience – Germination can take 4–8 weeks, so keep conditions stable and do not disturb the soil.