Thai Basil Seeds

Thai Basil (Ocimum basilicum var. thyrsiflora) sets itself apart from sweet Italian basil with a distinctive, spice-forward character: a bold anise-and-licorice aroma that holds up to heat and stays vivid even after cooking. Its leaves are narrower, firmer and a deeper glossy green, carried on eye-catching purple stems and topped with purple-tinged flower spikes — making the plant as ornamental as it is useful. This is the classic basil of Southeast Asian cooking, where it is added at the end of stir-fries, curries, noodle dishes and pho to release its peppery, fragrant punch.

Planting

Thai Basil is a warm-season, frost-sensitive annual, so timing matters. Start seed indoors 6 to 8 weeks before the last spring frost, or sow and transplant outdoors only after all danger of frost has passed and the soil has warmed — wait until nighttime temperatures stay reliably above 10 C. Sow the seed about 0.6 cm deep. Germination usually takes 5 to 10 days and is best at a soil temperature of about 18 to 21 C, with seedlings often emerging within 5 to 7 days. Once plants have 2 to 3 pairs of true leaves, thin or transplant them to their final spacing: roughly 15 to 30 cm apart for full plants, or closer at about 10 to 20 cm if you are growing for cut leaves, with direct-sown rows about 45 cm apart. Give the plants full sun — at least 6 to 8 hours of bright light a day in a warm, sheltered spot. In Egypt, start seed in protected seedbed conditions in late January to February and transplant out in March to April once nights are reliably above 10 C, for a long cutting season running from June through October; in Upper Egypt the milder winters let you transplant a few weeks earlier and even fit a second autumn crop. Avoid open-field sowing in the cold of December and January.

Fertilizing

Work in a low-nitrogen starter fertilizer before planting — for example a 5-10-5 or 5-10-10 blend at the recommended rate. If growth slows about two months after planting, side-dress with a light nitrogen feed such as roughly 0.1 to 0.2 kg of calcium nitrate per row section to keep leaves coming. Basil grown in good ground soil often needs no extra feeding at all. For container plants, give a diluted balanced liquid feed every 3 to 6 weeks, choosing an organic-based balanced feed and avoiding high-potassium fertilizers.

Care

Thai Basil is not drought tolerant and wants a fairly constant supply of soil moisture, so keep the soil evenly moist — water deeply about every 7 to 10 days, and more often for containers. Water at the base in the morning and avoid wetting the foliage, which helps limit disease. Begin picking young leaves as needed and pinch the terminal shoot tips at least weekly to keep growth bushy. For the best flavour, harvest just before flowering and pinch out flower buds as they appear; plants tend to start flowering in mid- to late summer, which turns them woody and makes leaves more bitter, so removing flower stems keeps quality high. For a full cut, take the plant back to about 10 to 15 cm above the ground to encourage regrowth, and harvest in the cool of the early morning. Watch for common pests such as aphids, slugs and snails, spider mites, whiteflies, Japanese beetles and leafhoppers, and for diseases including basil downy mildew, Fusarium wilt, gray mold, bacterial leaf spot and damping-off — base watering and dry foliage are your best defence against downy mildew.