Taxodium ascendens, commonly known as pond cypress, is a deciduous conifer native to shallow ponds, lake margins, and wetlands of the southeastern United States. This species has narrow internal dormancy that requires prolonged cold stratification (90 days at 4°C) to achieve consistent germination. Seeds are naturally dispersed in wet habitats and require saturated but not waterlogged conditions for optimal germination.
Before sowing
Cold stratification for 90 days in moist medium is essential to overcome internal dormancy. Seed coat must be kept moist during stratification period. Optional: soak in 2% NaOH solution for 24 hours followed by water soak for 24 hours to further enhance germination speed.
Sowing
What to expect
Tips
Maintain high humidity (saturated but not flooded) during stratification and germination phases. After stratification, sow seeds approximately 3/8 inch deep and tamp soil gently. Germination may be erratic, taking 1-3 months; do not discard non-germinated seeds prematurely. Provide bottom heat (20-22°C) for faster germination. Once seedlings emerge, gradually reduce heat and moisture while maintaining consistent moist soil. Protect seedlings from direct sun for first weeks. Optional: pre-treatment with hot water or scarification accelerates germination.
Sources: U.S. Forest Service FEIS, U.S. Army Corps of Engineers Wetland Plant List, Sheffield's Seed Company, University of Kentucky Horticulture, University of Florida IFAS, Wildflower.org, Wikipedia, Plantiary.com
