Blue Trumpet Vine (Thunbergia Grandiflora)
The Blue Trumpet Vine (Thunbergia grandiflora), also known as the Bengal Clock Vine or Blue Skyflower, is a powerhouse of the tropical garden. Native to India, this vigorous evergreen climber is world-renowned for its stunning clusters of large, trumpet-shaped flowers in a mesmerizing shade of sky blue or pale lavender, often with a soft yellow throat. Its lush, heart-shaped leaves provide a dense, emerald-green curtain that can quickly cover fences, pergolas, or even scale large trees. Often called "the most beautiful vine in the world," it is a favorite for gardeners wanting high-impact color and rapid, reliable growth.
Light
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Thrives in full sun to partial shade. To produce its maximum floral display, it needs at least 6 hours of direct sunlight. While it can grow in shadier spots, the foliage will remain lush but the number of flowers will significantly decrease.
Watering
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Requires regular watering, especially during the establishment phase and hot summer months. Keep the soil consistently moist but avoid waterlogging. Once established, it is moderately drought-tolerant but performs best with a steady supply of moisture.
Soil & Fertilizer
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Prefers rich, well-draining soil with plenty of organic matter. Feed monthly with a balanced organic fertilizer or a phosphorus-rich bloom booster during the flowering season (Spring to Autumn) to keep the trumpets coming.
Yellowing Leaves
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Usually a sign of overwatering or poor soil drainage. Ensure your pot or garden bed allows excess water to escape freely. It can also indicate a need for iron or nitrogen if the veins remain green while the leaf turns pale.
Sparse Flowering
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This is almost always due to insufficient light. Move the plant to a sunnier location or prune back overhanging trees that might be blocking the sun.
📋 Quick Plant Profile
| Botanical Name | Thunbergia grandiflora |
| Common Names | Blue Trumpet Vine, Bengal Clock Vine, Sky Flower |
| Flower Color | Sky Blue to Lavender with Yellow Throat |
| Blooming Season | Year-round (Peak in Summer/Monsoon) |
| Light Needs | Full Sun to Partial Shade |
| Growth Habit | Vigorous twining woody climber |
| Ideal For | Fences, Large Pergolas, Arches, Privacy screens |