Description
Campsis radicans is a vigorous, deciduous climbing vine native to the southeastern United States, widely cultivated for its striking, trumpet-shaped flowers in bright shades of orange to red. The plant produces long, woody stems equipped with aerial rootlets that allow it to cling strongly to walls, fences, and other structures, often reaching 6 to 12 meters or more in length.
The foliage consists of pinnate leaves with multiple serrated leaflets, creating a dense, lush cover during the growing season. In summer, clusters of large, tubular flowers appear, attracting hummingbirds and other pollinators. Its rapid growth and bold floral display make it a popular choice for covering trellises, arbors, and unsightly structures, though it can become invasive in some regions if not managed.
Campsis radicans thrives in full sun for best flowering but tolerates partial shade. It adapts to a wide range of soil types, including poor soils, as long as drainage is adequate. Once established, it is drought tolerant and highly resilient, requiring minimal care aside from pruning to control its spread.
Germination Guide
🌍 Eastern North America from New Jersey and Indiana south to Florida and Texas, north to South Dakota and Ontario, Canada
Difficult
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.
Germination
Germination time
Expect germination in
14 – 90 days
Temperature
Min 21°C
Ideal 24°C
Max 27°C
🌡️ Temperature alternation recommended
— Optimal germination (74%) occurs with alternating day/night temperatures of 35°C (day) / 25°C (night) with 12-hour photoperiod. Temperatures below 25°C or above 40°C reduce germination.
Substrate moisture
💧 Medium
Sowing depth
Lightly covered
Seed Pre-treatment
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💧
Soaking — 24 hours
Soak seeds in room temperature water for 24 hours to soften the seed coat after scarification.
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🔨
Mechanical scarification
Gently rub seeds with sandpaper or nick with a knife to break the hard seed coat and enhance water absorption.
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❄️
Cold stratification — 60 days at 4°C
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📋
Additional notes
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.
Substrate & Container
Recommended substrate
Well-draining seed starting mix of peat moss and perlite, or peat-free potting compost with organic matter
Recommended container
Seed trays, small pots, or containers with drainage holes; cover with plastic wrap to maintain moisture
Growing 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.
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