How to Grow Thunbergia Alata Lemon Star
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Thunbergia Alata Lemon Star
Thunbergia alata 'Lemon Star'
vineLemon Star is a cultivar of Black-eyed Susan vine, a tender perennial climbing vine native to Africa. It produces abundant bright yellow flowers with deep burgundy-black centers, blooming prolifically from summer through fall. This vigorous vine is perfect for trellises, hanging baskets, and containers, bringing cheerful color to gardens and patios.
When should you plant Thunbergia Alata Lemon Star in your zone?
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Example Thunbergia Alata Lemon Star timeline · Pittsburgh, PA (Zone 6b)
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Plant Thunbergia Alata Lemon Star
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Thunbergia Alata Lemon Star
Around Jun 6≈ 50 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Thunbergia Alata Lemon Star dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Zones 10-11; grown as annual in cooler zones
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Germination & Seedling
2-3 weeksTiny seedlings emerge with first true leaves appearing within 7-14 days. Plants develop 2-4 pairs of leaves and establish initial root system.
Keep soil warm (70-75°F), moist, and under bright light. Provide 12-14 hours of light daily. Thin seedlings to prevent crowding. Do not bury seeds; they need light to germinate.
Vegetative Growth
3-4 weeksVine develops multiple stems and climbing tendrils. Foliage becomes fuller and more vigorous. Plant establishes strong root system in containers or garden beds.
Provide support structure (trellis, stakes). Fertilize every 2-3 weeks with balanced or slightly higher phosphorus fertilizer. Pinch back growing tips early to encourage bushier growth. Water consistently.
Flowering Initiation
1-2 weeksFirst flower buds appear along the vine. Plant reaches blooming maturity and begins producing characteristic bright yellow flowers with black centers.
Continue regular fertilizing, shifting to slightly higher phosphorus to promote flowering. Ensure full sun exposure for maximum blooms. Deadhead spent flowers regularly to encourage continuous blooming.
Peak Flowering
12-16 weeks (summer to fall)Abundant bright lemon-yellow flowers with deep burgundy-black centers cover the vine. Blooming is prolific and continuous from summer through fall.
Deadhead regularly to maintain flowering. Water consistently during hot weather. Continue light fertilizing every 3-4 weeks. Monitor for pests and diseases. Support heavy vine growth with sturdy trellising.
Decline & End of Season
6-8 weeksIn fall, flowering slows as temperatures cool. In frost-prone areas, vine dies back after first frost. In zones 10-11, vine may slow significantly in winter but may regrow in spring.
Reduce watering as plant slows. Stop fertilizing. In cool zones, treat as annual and compost plant. In warm zones, prune back by one-third to encourage spring regrowth; reduce watering and protect from frost.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with water to dislodge; use insecticidal soap or neem oil if infestation severe. Increase humidity around plant.
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Use yellow sticky traps; spray with neem oil or insecticidal soap. Remove heavily infested leaves.
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Isolate infected plant; spray with rubbing alcohol on cotton swab or use insecticidal soap. Treat weekly until cleared.
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Hand-pick early morning or evening. Use beer traps, copper barriers, or food-grade diatomaceous earth around base.
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Ensure good air circulation; avoid wetting foliage. Spray with sulfur dust or potassium bicarbonate fungicide if needed.
Uses
Edible Flowers
CulinaryThe bright yellow flowers with black centers are edible and make striking garnishes for salads, desserts, and beverages. They have a subtle sweet flavor and add visual appeal to gourmet dishes. [source]
Cut Flowers & Arrangements
CraftLemon Star blooms make excellent fresh cut flowers for small bouquets and arrangements. The vibrant contrasting colors last well in water and brighten indoor spaces. [source]
Container & Vertical Gardening
HouseholdIdeal for hanging baskets, window boxes, and container gardens on patios and balconies. Its trailing, vining habit makes it perfect for creating living walls and vertical displays with minimal space. [source]
Pollinator Attractor
WildlifeThe abundant flowers attract bees, butterflies, and hummingbirds, making it an excellent choice for pollinator-friendly gardens. It provides nectar throughout the long summer and fall blooming season. [source]
Ornamental Screening
HouseholdThe vigorous vining growth can be trained on trellises, arbors, or fences to create living screens and focal points. It provides seasonal color and texture to garden structures. [source]
Harvest Tips
Thunbergia is grown for ornamental flowers rather than harvest. Deadhead spent blooms regularly by pinching or cutting below the flower to encourage continuous flowering. In zones 10-11, you can collect seeds in fall after flowers fade and pods dry; however, 'Lemon Star' may not come true from seed. For propagation, take softwood cuttings in spring or early summer and root in moist potting mix.
Fun Facts
- 🌱 Thunbergia alata gets its common name 'Black-eyed Susan vine' from the distinctive dark center that resembles an eye, yet despite the name, it's not related to the traditional Black-eyed Susan flower (Rudbeckia).
- 🌱 The genus Thunbergia is named after Swedish botanist Carl Peter Thunberg, and the species is native to East Africa, where it grows as a perennial in warm climates.
- 🌱 The 'Lemon Star' cultivar produces clusters of flowers that bloom in succession over many months, with a single healthy vine capable of producing hundreds of flowers per season.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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