Outsidepride Basil Thai Ocimum Basilicum Herb Plant Seed - 5000 Seeds Thai Basil grows as an annual in USDA Zones: 4 - 9. It thrives in any full sun herb garden, vegetable garden or as container plant. Ocimum Basilicum Thai Siam Queen grows to a height of 30 - 40 inches and is hightly aromatic with purple blooms in the summer. This scented culinary herb is often used in tomato dishes, pasta sauces, vegetables and soup. Sow these heirloom seeds at 1 seed per inch in well-drained soil and keep moist until germination occurs in 5 - 10 days. Our seeds are always Non-GMO and packaged for the current year.