Campsis radicans, commonly known as Trumpet Vine or Trumpet Creeper, is a vigorous, deciduous woody vine native to eastern North America. It is renowned for its showy, trumpet-shaped orange to red flowers that attract hummingbirds throughout summer. Seed germination requires cold stratification, making propagation from seed challenging but rewarding for patient gardeners.
Before sowing
Cold stratification at 4°C for 60 days is essential for breaking dormancy. After cold period, move seeds to warm location (20-22°C) for germination.
Sowing
What to expect
Tips
For best results: (1) Scarify seeds mechanically before soaking to ensure maximum germination rates. (2) Ensure consistent moisture during cold stratification in refrigerator (not waterlogged). (3) After cold period, maintain warm temperatures (20-22°C) with light exposure and 12-hour photoperiod. (4) Use well-draining seed mix to prevent damping-off. (5) Germination is slow and erratic; do not discard trays prematurely as seeds may germinate 30-90 days after warming. (6) Seedlings require bright light and gradual acclimatization to outdoor conditions. (7) Plant surface-sown or just barely covered; do not bury seeds deeper than 1/16 inch. (8) Keep soil moist but not waterlogged throughout germination period.
Sources: Chachalis & Reddy (2000) - Cambridge Weed Science; Ferri Seeds; Smart Seeds Emporium; Plant Finder sources; USDA Forest Service; RHS Growing Guide; Multiple seed company instructions
