Paulownia tomentosa is a fast-growing deciduous tree native to central and eastern China, known for its beautiful violet-blue foxglove-like flowers and large velvety leaves. Seeds have a mandatory high light requirement for germination and require surface sowing with constant moisture; cold stratification for 2 months at 4°C significantly enhances germination rates and reduces germination time.
Before sowing
Cold stratification for 2 months at 4°C reduces the very high light requirement and shortens germination time
Sowing
What to expect
Tips
Surface sow seeds without covering soil. Mix tiny seeds with sand or vermiculite for even distribution. Keep substrate moist using misting; do not allow desiccation. Use spunbonded polyester fabric or clear plastic cover to maintain high humidity and light penetration. Maintain substrate at 18-20°C. Germination typically appears within 7-21 days. Thin seedlings to one per container when large enough to handle. Protect young seedlings from pests. Cold stratification for 60 days at 4°C prior to sowing significantly improves germination and shortens germination period. Avoid waterlogged conditions; well-drained substrate is essential.
Sources: University of Kentucky Forestry Publications (FOR-39), Sheffield Seeds, Chiltern Seeds, research on Paulownia tomentosa germination physiology
