How to Grow Super Thai Basil
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Super Thai Basil
Ocimum basilicum var. thyrsiflora
herbSuper Thai basil is a vigorous, bushy variety of Thai basil known for its intense licorice and clove-like flavor with subtle spice notes. It produces small, purple-tinged flowers and narrow leaves on sturdy stems, making it ideal for Southeast Asian cuisine and ornamental garden use. This variety is more productive and cold-tolerant than standard Thai basil varieties.
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Example Super Thai Basil timeline · Pittsburgh, PA (Zone 6b)
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Plant Super Thai Basil
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 Super Thai Basil
Around May 27≈ 40 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Super Thai Basil dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 10-11; grow as annual in cooler zones (zones 3-9)
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Seedling
2-3 weeksTiny sprouts with two seed leaves (cotyledons) emerge. True leaves follow within 1-2 weeks.
Keep soil consistently moist. Provide bright light (12-14 hours) to prevent leggy growth. Maintain warm temperatures (70-75°F). No fertilizer needed yet.
Vegetative Growth
3-4 weeksPlant develops true leaves and becomes bushier. Stems are still tender and green. Rapid leaf production.
Pinch off growing tips when plant reaches 6 inches to encourage branching. Begin light fertilizing weekly with balanced fertilizer (NPK 10-10-10). Ensure adequate light and warmth (65-80°F).
Pre-flowering
2-3 weeksPlant reaches mature size (12-18 inches) and becomes quite bushy. Purple-tinged flowers begin forming at leaf axils.
Continue pinching flower buds to extend leaf harvest and delay flowering. Remove any diseased leaves. Keep harvesting to maintain bushiness and productivity.
Flowering
3-6 weeks (until frost or dormancy)Small, tubular purple-pink flowers bloom in dense spikes. Leaves become slightly smaller and more intensely flavored.
Deadhead spent flowers to prolong vegetative growth and leaf production. Harvest leaves regularly before and after flowering. Flowers are edible and attract pollinators.
Seed Set & Decline
4+ weeksIf allowed to go to seed, flowers develop into tiny dark seeds in papery calyxes. Plant growth slows.
Allow some flowers to mature for seed collection if desired. In cool climates, plant growth declines significantly. In zones 10-11, may regrow after pruning hard.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Hand-pick in early morning; use row covers; apply neem oil if severe
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Spray with water to dislodge; increase humidity; apply miticide or neem oil
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Use sticky traps; spray with insecticidal soap or neem oil; introduce parasitic wasps
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Spray with water; apply insecticidal soap; encourage natural predators like ladybugs
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and
Hand-pick, especially at dusk; use beer traps; apply diatomaceous earth around base
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Use disease-resistant varieties when possible; avoid overhead watering; remove infected plants; sterilize soil
Uses
Southeast Asian Cuisine
CulinarySuper Thai basil is essential in Thai cooking, Vietnamese pho, and Cambodian dishes. Its distinctive licorice and clove notes enhance curries, stir-fries, soups, and pad krapow moo (Thai basil pork). [source]
Fresh Garnish & Drinks
CulinaryUse fresh leaves as garnish for Asian noodle dishes, cocktails, and mocktails. The aromatic leaves add complexity to Vietnamese iced coffee and herbal teas. [source]
Traditional Medicine
MedicinalThai basil has been used in traditional Asian medicine to aid digestion, reduce inflammation, and support respiratory health. Contains compounds with antimicrobial and antioxidant properties. [source]
Culinary Flavoring & Preservation
HouseholdDry leaves for long-term storage in spice jars or freeze in oil for convenient cooking. Creates aromatic herbal vinegars and infused oils. [source]
Pollinator Support
WildlifeThe flowers attract bees, butterflies, and other beneficial insects, supporting garden pollinator populations and ecosystem health. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Begin harvesting leaves 4-6 weeks after planting when plant has 6+ true leaves. Pinch off top 0.25-0.5 inches of stems to encourage branching. Harvest regularly (every 5-7 days) to maintain productivity and prevent flowering. Morning harvest after dew dries offers best flavor and longevity. Cut just above leaf nodes to promote two new stems. Use leaves fresh for best intensity; dry or freeze for preservation. Flowers are edible and can be harvested when fully open.
Fun Facts
- 🌱 Super Thai basil produces far more leaves per plant than standard sweet basil, making it exceptionally productive for home gardeners and small-scale growers.
- 🌱 The purple-tinged flowers are completely edible and add an attractive garnish to dishes while offering the same licorice-spice flavor as the leaves.
- 🌱 Thai basil is sometimes called 'holy basil' or 'tulsi' in Western markets, though true holy basil (Ocimum tenuiflorum) is a different species with different flavor and growing requirements; Super Thai is Ocimum basilicum var. thyrsiflora.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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