Botanical Name: Thunbergia alata ‘Sunny Susy® Yellow Eye’ Common Name: Black-Eyed Susan Vine Hardiness Zone: Grown as an Annual in All Climates Size: 48–72" Tall × 18–24" Spread (Trailing/Climbing) Growth Habit: Vigorous, Trailing, Climbing, Well-Branched Sunlight: Full Sun to Partial Shade Soil: Well-Drained, Fertile Soil Water Needs: Moderate; Drought Tolerant Once Established Bloom Season: Late Spring through Frost Fertilizer: Light, Regular Feeding for Best Flowering Features: Bright Golden Yellow Blooms with Dark Centers, Fast Growth, Heat Tolerant, Continuous Blooming Uses: Containers, Hanging Baskets, Trellises, Fences, Obelisks, Mixed Planters Patent: ✔ Patented Propagation: ❌ Propagation Prohibited Without License

More About Thunbergia ‘Sunny Susy® Yellow Eye’

Thunbergia ‘Sunny Susy® Yellow Eye’ delivers bold, sunshine-yellow flowers highlighted by a contrasting dark center that instantly draws the eye. The blooms appear in abundance against rich green foliage, creating a classic summer look that feels both cheerful and tropical.

Part of the improved Sunny Susy® series, this variety was bred for stronger branching, better flower coverage, and more reliable garden performance than traditional Black-Eyed Susan vines. Its rapid growth makes it an excellent choice for quickly filling vertical spaces or adding dramatic spill to containers and baskets.

Why We Like It (Our Trials)

In our trials, ‘Sunny Susy® Yellow Eye’ has been a dependable warm-season performer, thriving in full sun, heat, and humidity without slowing down. It begins flowering early and continues steadily through the hottest part of summer with minimal care.

We especially appreciate how quickly it transforms a space. Whether climbing a trellis or cascading over the edge of a pot, it adds instant energy and movement. The bright yellow blooms hold their color well in strong sun, making this one of our favorite options for high-visibility summer displays.

‘Sunny Susy® Yellow Eye’ vs. Other Thunbergia

Compared to standard Thunbergia varieties, the Sunny Susy® series offers more uniform growth, heavier flowering, and improved branching. ‘Yellow Eye’ stands out for its vivid color, fast coverage, and consistent bloom production across a wide range of summer conditions.

For gardeners looking for a fast-growing, heat-loving annual vine with bold color and season-long impact, Thunbergia ‘Sunny Susy® Yellow Eye’ is an excellent choice.