Basil | Thai

Grow aromatic, glossy green leaves and striking purple stems of Thai Basil right in your home garden. This beloved culinary herb is prized across Southeast Asian cuisine for its sturdy leaves, vibrant violet-purple flower spikes, and bold, complex flavor profile that blends sweet basil with distinct notes of anise, licorice, and warm spice.

Unlike traditional Italian sweet basil, Thai Basil holds its texture and pungent aroma even under high-heat cooking, making it indispensable for stir-fries, curries, and steaming bowls of pho. Compact, bushy, and remarkably heat-tolerant, these 12- to 18-inch plants thrive in sunny herb gardens, raised beds, and patio containers across Canada while doubling as a stunning ornamental pollinator magnet.

Why Grow Thai Basil?

• Classic Southeast Asian culinary herb featuring glossy green leaves, purple stems, and violet blossoms
• Bold, sweet, and spicy flavor profile with rich notes of anise and licorice
• Retains its distinctive aroma and leaf structure during high-temperature stir-frying and simmering
• Compact, bushy growth habit ideal for patio containers, window boxes, and herb borders
• Ornamental purple flower spikes attract bees, butterflies, and beneficial garden pollinators
• Approximately 60–75 days to maturity
• Grows best in full sun
• Open-pollinated heirloom variety
• Approximately 100 seeds per packet

How to Grow Thai Basil from Seed

Start Thai basil seeds indoors 4–6 weeks before your last expected spring frost date, or direct sow outdoors once all danger of frost has passed and nighttime temperatures remain consistently above 10°C (50°F).

Sow seeds lightly on the surface of moist seed-starting mix or 3 mm (1/8 inch) deep, pressing gently for good soil contact without burying deeply, as basil requires light to germinate. Maintain warm soil temperatures of 21–27°C (70–80°F).

Transplant or thin seedlings outdoors to a final spacing of 20–30 cm (8–12 inches) apart in a warm, sheltered location receiving full sun with rich, well-draining soil. Water regularly at the base of the plant to keep soil evenly moist without waterlogging.

Pinch back growing tips and early flower buds regularly once plants reach 15 cm (6 inches) tall to encourage dense, bushy branching and continuous leaf production all summer long.

Growing Thai Basil in Canada

Thai Basil thrives during warm Canadian summers when given a sunny, wind-sheltered spot or grown in heat-retaining patio containers. Because basil is sensitive to cold temperatures, waiting until late May or early June to transplant outdoors ensures rapid, vigorous establishment across Canadian growing zones.

Container-grown plants can also be brought indoors onto a bright, sunny windowsill in late August or early September to extend your fresh herb harvest well into autumn.

For detailed instructions covering seed starting, spacing, watering, fertilizing, harvesting, and pest management, read our How to Grow Thai Basil in Canada | Complete Guide.

Thai Basil Growing Information

Feature	Detail
Botanical Name	Ocimum basilicum var. thyrsiflora
Common Name	Thai Basil / Asian Basil / Sweet Anise Basil