Thunbergia grandiflora – Blue Sky Vine for Big Summer Color

Thunbergia grandiflora – Blue Sky Vine for Big Summer Color Thunbergia grandiflora, commonly called blue sky vine or Bengal clock vine, is a vigorous tropical flowering vine known for its large lavender-blue, trumpet-shaped blooms and lush green foliage. This fast-growing climber is perfect for adding vertical color to trellises, fences, arbors, or large patio containers. In warm climates, Thunbergia grandiflora can grow into a bold, evergreen vine, producing waves of soft blue to violet flowers through the warm season. In cooler areas, it can be enjoyed as a fast-growing annual or overwintered in a protected location. Give it a strong support structure and plenty of room—this is a vigorous grower that can quickly create a full, tropical look. At maturity, Thunbergia grandiflora can reach 20 feet or more where hardy, though it can be kept smaller with pruning or container culture. It performs best in full sun to part shade, with some afternoon shade appreciated in very hot climates. It is generally hardy in USDA Zones 10–11, though some growers report it returning from the roots in protected Zone 8b–9 locations. Plants are shipped growing in a 3-quart pot on a 36-inch trellis, giving you a well-started vine ready to continue climbing and blooming through the warm season. Care Notes: Plant in full sun to part shade with moist, well-drained soil. Provide a trellis, fence, arbor, or other sturdy support. Water regularly while establishing and prune as needed to shape or control growth. Protect from frost in colder climates. 🔗 For planting and care tips, visit our Growing Instructions.