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Basil (Thai) is an essential herb in Southeast Asian cooking, carrying an entirely different flavor profile from Italian Genovese basil — anise-forward, slightly spicy, with subtle clove and licorice notes that hold up to cooking heat far better than the more delicate Italian types. It is the basil of Thai green and red curries, Vietnamese bun cha and pho garnishes, Taiwanese three-cup chicken, and Indonesian rendang — dishes that would be fundamentally incomplete without it. Thai basil's narrow, shiny leaves are dark green with distinctive purple stems and bracts, and its flavor intensifies when cooked rather than fading the way Genovese basil does. The plants are more bolt-resistant than Italian basil varieties, producing fragrant purple flower spikes that are themselves edible and often used as a garnish in Thai restaurants.
Grow Thai basil with the same basic care as Genovese basil — full sun, warm soil, consistent moisture — but note the important differences. Thai basil is more heat-tolerant and slightly more drought-tolerant than Italian types, making it well-suited to the hot, humid summers of zones 6–10. It is also more bolt-resistant; while you should still pinch emerging flower buds to prolong the main harvest, Thai basil's inflorescences are beautiful and the flowers are edible, so you can allow some plants to flower freely for ornamental and culinary use once you have enough leaf production from other plants. Start seeds indoors 6–8 weeks before last frost; Thai basil seeds germinate more slowly and irregularly than Italian types, taking 10–14 days at 70°F. Space plants 12 inches apart in beds or grow in 8-inch pots. Thai basil's flavor is at its most intense when leaves are added near the end of cooking (last 30 seconds), or used raw as a garnish — prolonged cooking mutes its aromatic character. Harvest regularly by cutting stems back to lateral buds; the plant branches strongly in response to harvesting. The purple flowers are edible, with a flavor similar to the leaves; scatter them over Thai salads or noodle dishes as an authentic garnish.
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