Hardy Rubber Tree Seeds
(Eucommia ulmoides) Perennial. Zone 5. Native range—China.
Also known as Du Zhong in Traditional Chinese Medicine or Gutta-percha, rarely found in the wild now. Highly adaptable to urban environments, drought tolerant. Can grow 35-45 feet tall. Ability to re-sprout after being cut down. Keep sheltered from harsh cold winds. Known for its ornamental beauty and many medicinal properties.
GROWING INSTRUCTIONS
For best results, sow seeds outdoors in the Fall, mulch beds (remove mulch once seeds germinate in Spring). If starting indoors...
SEED PRETREATMENT: Soak seeds in water for 12 hours. Then, mix seeds with moistened soil 4x seed volume. Place in a plastic bag or container.
STRATIFICATION: 90 days cold/moist (5°C). Place plastic bag with seeds and soil in your refrigerator, preferably in a veggie crisper. Inspect periodically for even moisture, don’t let seeds dry out during stratification period.
POST-STRATIFICATION: Sow stratified seeds 1/4” deep. Alternating soil temperatures during the day (warmer than 20 °C) and night (cooler than 20°C) can help germination. Water evenly.
GERMINATION: When all previously mentioned requirements are fulfilled, germination generally occurs in 30-45 days.
Stratifying Seeds Naturally Outdoors in the Fall
How to Stratify Tree Seeds Indoors
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Available direct from Incredible Seeds, a Canadian Heirloom and Heritage Seed Company, offering only the best natural, non-GMO, open pollinated and untreated seeds, located in Mi'kma'ki / Nova Scotia.