Vine
Blue Sky Vine
Thunbergia grandiflora
Varieties We Carry
Blue BellThunbergia grandifloraBlue SkyThunbergia grandiflora
Sizes & Pricing
3 galFrom$14.95
7 galFrom$69.95
Fresh this week. Last restocked Mar 25.
LightFull Sun, Part Sun
WaterModerate
Mature size15-30 feet × 6-10 feet
About Blue Sky Vine
Blue Sky Vine or Bengal Clockvine (Thunbergia grandiflora) is a vigorous tropical twining vine from India, producing large, sky-blue to lavender trumpet-shaped flowers with a pale yellow throat in hanging clusters. It climbs rapidly and blooms prolifically in warm weather, making it one of the most impressive flowering vines for tropical landscapes. Starting at $14.95.
Plant details
- Bloom Season
- Summer, Fall
- Flower Color
- Purple, Blue
- Growth Rate
- Fast
- Foliage
- Semi-evergreen
- Soil
- Sandy, Loam, Well-drained
Best planting months
Recommended forZone 9b · St. Augustine, FL
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This monthGood windowOther months
Seasonal care
Good planting window.
Bloom season.
Bloom season. Ideal planting window.
Retains foliage through winter.
Care essentials
Light
Grow Blue Sky Vine in full sun for maximum flowering; part sun is tolerated but reduces bloom production. Provide a sturdy trellis, fence, or pergola — this vine climbs by twining and grows aggressively in NE Florida's warm climate.
Water
Water regularly during establishment; once established, moderate irrigation is sufficient. This vine is vigorous in Florida's heat and humidity — avoid overwatering in heavy soils. In zone 9b, tops may die back in a hard freeze but roots typically resprout in spring.
Soil & Fertilizer
Plant in well-drained sandy or loamy soil. Apply a balanced slow-release fertilizer in spring to encourage growth. Prune hard after flowering or in late winter to keep this vigorous vine in bounds — it can overwhelm nearby plants and structures. Note: UF/IFAS flags Thunbergia grandiflora as potentially invasive in Florida; monitor carefully to prevent spread into natural areas.
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Common questions
Is Blue Sky Vine a good plant for St. Augustine?
Blue Sky Vine is a vine for Zone 9b coastal Florida gardens, reaching 15-30 feet × 6-10 feet.
Care information verified from
Last reviewed February 2026. Our care guidance comes from trusted horticulture sources and decades of helping St. Augustine gardeners. Conditions here can vary dramatically from one area to the next, so come ask us and we'll tailor it to your yard.