Thai basil brings the mystical flavors of Southeast Asia to your garden with its distinctive anise and licorice notes woven through sweet and spicy undertones. This compact, ornamental herb grows 12-24 inches tall on striking purple stems, producing glossy dark green leaves and beautiful purple flowers that open to lavender. Hardy in zones 2-11, it reaches harvest in about 65 days and thrives in containers, making it perfect for bringing authentic Thai cuisine flavors right to your kitchen door.
Photo © True Leaf Market
Growing Conditions
USDA Zone
4-11
Sunlight
Full Sun
Water
High
Soil
Well-drained, Fertile Loam
Preferred Temp65-85°F
Growth Stats
24 in
Height
12 in
Width
12 in
Spacing
50–60
Days to Harvest
PeriodAnnual
TypeBush
Plant Profile
Sunlight
Full Sun
Water
High
Zones
4-11
Size
24in H x 12in W
Growth
Annual
Care
High
Hover over chart points for details
Highlights
What sets Thai basil apart is its concentrated, heat-stable flavor that actually improves under high cooking temperatures, unlike its Italian cousin that wilts under heat. The plant's stunning purple stems and flower buds make it as ornamental as it is functional, while its robust licorice and anise flavor profile adds authentic depth to curries, stir-fries, and pho. This variety has been cultivated for over 5,000 years and remains a symbol of good fortune and protection in Thai culture, bringing both mythical significance and practical culinary magic to modern gardens.
Common Uses
Thai basil excels in the high-heat cooking that defines Southeast Asian cuisine, where whole leaves are added by the handful to green and red curries, spicy stir-fried dishes, and aromatic Vietnamese pho. Its leaves can be used fresh in tomato salads where the licorice notes provide an unexpected twist, or dried for longer storage. Beyond culinary uses, the fragrant leaves serve aromatherapy purposes when placed under the eyes or massaged on temples for stress relief, and the herb can be crafted into natural soaps by mixing with liquid glycerin and essential oils.
Growing Timeline
First Bloom
Late Spring
First Harvest
Early Summer
Last Harvest
Late Summer
Care Instructions
Start Indoors
Start seeds indoors 6-8 weeks before the last frost date, planting 4-6 seeds per cell at 1/4 inch deep in moderately moist, well-drained soil. Seeds germinate in 5-10 days at temperatures between 60-75°F.
Transplant Outdoors
Transplant well after frost when nighttime temperatures are consistently above 50°F and weather has stabilized. Harden off seedlings before transplanting and space plants 8-12 inches apart in the garden.
Direct Sow
Direct sow after all danger of frost has passed, planting seeds 1/4 inch deep and 3-4 inches apart in warm, well-drained soil in full sun.
Harvesting
Begin harvesting when plants reach 6-8 inches tall for the best flavor, cutting leaves in the morning when their essential oils are most concentrated. Harvest continually throughout the growing season, taking care to pinch off flowers to encourage leaf growth. Make your final harvest before temperatures drop below 40°F, as the plant will not survive cold weather.
Pruning
Pinch off the tallest growth and flower buds regularly to prevent the plant from flowering, as the flavor becomes too strong once in bloom. Remove the top several sets of leaves on each stem while leaving at least three sets of leaves on the lower portion to encourage continued leaf production.
Growing Calendar
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Companion Planting
Ecology & Traits
Edible
Scientific Classification
Ocimum L.
Family
Lamiaceae
Genus
Ocimum
Duration
Annual
Growth Habit
Upright
Native Status
L48 (I)HI (I)PR (I)
History & Origin
“Thai basil has graced Southeast Asian gardens for over 5,000 years, with its roots tracing back to native regions of India and Iran before spreading throughout Thailand, Vietnam, and Laos. Unlike the familiar Italian basils that traveled westward, this variety remained concentrated in Asian cuisines, where it became deeply woven into both culinary traditions and cultural beliefs. Ancient Thai scrolls speak of basil's association with legends and deities, and the herb has long been revered not just as a cooking ingredient but as a symbol carrying spiritual significance through generations of Asian gardeners.”