About Black-Eyed Susan Vine
A charming, fast-growing twining vine with cheerful, flat-faced flowers featuring a distinctive dark brown-black center ('eye') surrounded by petals in warm shades of orange, yellow, or cream. Much smaller and more delicate than its cousin Thunbergia grandiflora (the blue sky vine already common in Philippine gardens), this species is ideal for trellises, fences, and hanging baskets where its profuse blooms create a sunny cottage-garden effect. Black-Eyed Susan Vine belongs to the Acanthaceae family and originates from Tropical East Africa; widely cultivated and naturalized in tropical regions worldwide..
Not to be confused with Thunbergia grandiflora (the large-flowered blue sky vine commonly called 'thunbergia' in Philippine nurseries), this smaller-flowered species is a different garden experience — more intimate, more colorful, and better suited to small trellises and containers. Filipino gardeners are starting to appreciate it for cottage-style and Instagram-worthy garden setups. Available from seed or seedlings at specialty nurseries and online plant shops. Excellent for small urban gardens in Metro Manila where the larger thunbergia would be overwhelming.
Also known as: Thunbergia.
Popular Varieties
- Thunbergia alata 'Susie Orange' (bright orange with dark eye)
- Thunbergia alata 'Susie Yellow' (golden yellow with dark eye)
- Thunbergia alata 'Blushing Susie' (apricot and peach tones)
- Thunbergia alata 'Alba' (white flowers with dark eye)
- Thunbergia alata 'African Sunset' (red, orange, and cream mix)
How to Plant Black-Eyed Susan Vine in the Philippines
Black-Eyed Susan Vine can be propagated through seeds, stem cuttings. The recommended method is seeds — they germinate readily in philippine warmth.
Propagation Steps
- Step 1: Soak seeds in lukewarm water for 24 hours to soften the seed coat.
- Step 2: Sow seeds 1 cm deep in moist potting mix or seedling trays.
- Step 3: Keep warm and moist — germination occurs in 10-21 days.
- Step 4: Transplant seedlings to final containers or garden beds when 10-15 cm tall.
- Step 5: Provide a trellis, string, or fence for the vine to climb.
- Step 6: Alternatively, take 10-15 cm stem cuttings and root in moist soil for faster results.
Care Guide
Sunlight
Full sun to partial shade (flowers best in full sun, tolerates morning sun with afternoon shade). Position your black-eyed susan vine where it receives the right amount of light for healthy growth in Philippine conditions.
Water
Keep soil consistently moist but not soggy. Water 2-3 times per week during dry season. Reduce during rainy season. Adjust frequency during the Philippine rainy season when humidity is higher and soil stays moist longer.
Temperature & Humidity
Ideal temperature range: 24-32°C (grows well in Philippine lowlands; may flower less in extreme heat above 35°C). Moderate to high — comfortable with Philippine humidity The warm, humid Philippine climate is well-suited for growing black-eyed susan vine outdoors or indoors.
Fertilizer
Bloom-boosting fertilizer (high phosphorus, such as 10-30-10) every 3-4 weeks during flowering season.
Pruning
Trim back after major flowering flush to encourage fresh blooms. Guide vines onto trellis or support. Remove tangled or dead growth.
Toxicity & Safety
Non-toxic. Safe around children and pets.
Common Problems & Solutions
Few or no flowers
Cause: Too much shade or excess nitrogen fertilizer
Solution: Move to full sun. Switch to a high-phosphorus bloom fertilizer. Avoid nitrogen-heavy feeds.
Spider mites on undersides of leaves
Cause: Dry, hot conditions with poor air circulation
Solution: Mist leaves regularly. Spray with neem oil or insecticidal soap. Increase humidity around the plant.
Vine becoming invasive or tangled
Cause: Natural vigorous growth habit
Solution: Prune regularly and guide vines onto supports. Clock vine is much less aggressive than Thunbergia grandiflora, but still needs management.
Whiteflies clustering on new growth
Cause: Common pest on soft-stemmed tropical vines
Solution: Spray with neem oil. Use yellow sticky traps near the plant. Encourage natural predators.
Frequently Asked Questions
How do you care for Black-Eyed Susan Vine in the Philippines?
Black-Eyed Susan Vine needs full sun to partial shade (flowers best in full sun, tolerates morning sun with afternoon shade). Water keep soil consistently moist but not soggy. water 2-3 times per week during dry season. reduce during rainy season.. Feed with bloom-boosting fertilizer (high phosphorus, such as 10-30-10) every 3-4 weeks during flowering season.. The Philippine climate with temperatures of 24-32°C (grows well in Philippine lowlands; may flower less in extreme heat above 35°C) works well for this plant.
How do you propagate Black-Eyed Susan Vine?
The recommended method is seeds — they germinate readily in philippine warmth. Soak seeds in lukewarm water for 24 hours to soften the seed coat. Sow seeds 1 cm deep in moist potting mix or seedling trays.
Is Black-Eyed Susan Vine toxic to pets or children?
Non-toxic. Safe around children and pets.
Can Black-Eyed Susan Vine grow in containers in the Philippines?
Yes, Black-Eyed Susan Vine grows well in containers and is suitable for balcony and indoor gardening in Metro Manila condos and apartments. Use a pot with drainage holes and appropriate potting mix.
What are common problems when growing Black-Eyed Susan Vine?
Common issues include: Few or no flowers (caused by too much shade or excess nitrogen fertilizer — move to full sun. switch to a high-phosphorus bloom fertilizer. avoid nitrogen-heavy feeds); Spider mites on undersides of leaves (caused by dry, hot conditions with poor air circulation — mist leaves regularly. spray with neem oil or insecticidal soap. increase humidity around the plant); Vine becoming invasive or tangled (caused by natural vigorous growth habit — prune regularly and guide vines onto supports. clock vine is much less aggressive than thunbergia grandiflora, but still needs management).
Growing black-eyed susan vine in Manila? Tag us @urbangoesgreen on TikTok and show us your garden!