How to Grow Thai Basil

A warm-season herb for the home garden across the warmer US.

Thai Basil is a rewarding warm-season crop for backyard growers.

When to plant

Plant Thai Basil in spring once the soil has warmed and all frost has passed. In the warmest regions a second crop is possible in late summer. See your region on the thai basil page for exact timing.

Varieties

• Siam Queen, Robust, aromatic Thai basil (Johnny's Selected Seeds)

How to grow it

• Sun & soil: full sun, rich well-drained soil with even moisture.
• Spacing: about 25 cm (10 in) between plants.
• Sowing: barely cover the seed.
• Water: roughly 4 L per plant every 2 days in hot weather.
• Containers: grows well in a pot of 20cm+.

Pests & problems

Watch for Aphids, Whitefly and Slugs. In humid regions, Fusarium wilt and Downy mildew can appear, so space for airflow and water at the roots in the morning.

Harvest

Thai Basil is usually ready to harvest in about 2 months. Pick regularly to keep plants productive.

When to plant in your region

Pick your region to see exactly when to plant thai basil where you garden.

See also: Thai Basil in the plant library →

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