Thai Basil
Ocimum basilicum var. thyrsiflora
A lush herb with pointed, green leaves, reddish-purple stems, and a distinct spicy, anise-like scent. Unlike sweet basil, it maintains its shape and flavor well under high cooking temperatures.
- Light
- Full sun, at least 6-8 hours of direct light per day.
- Water
- Requires consistent moisture; water when the top inch of soil feels dry. It is not drought-tolerant and will wilt quickly if thirsty, but recovers fast once watered.
- Growth
- Bushy annual or short-lived perennial, typically reaching 12-18 inches in height and spread.
Care instructions
Thrives in warm environments with plenty of sunlight and consistent moisture. Pinch back flower buds to encourage foliage growth and harvest regularly. Fertilize lightly every 4-6 weeks during the growing season.
Growing details
Sunlight
Full sun, at least 6-8 hours of direct light per day.
Watering
Requires consistent moisture; water when the top inch of soil feels dry. It is not drought-tolerant and will wilt quickly if thirsty, but recovers fast once watered.
Soil
Rich, well-draining soil with a pH between 6.0 and 7.5.
Hardiness zone
USDA zones 10-11 as a perennial; grown as an annual elsewhere.
Growth habit
Bushy annual or short-lived perennial, typically reaching 12-18 inches in height and spread.
Bloom season
Late summer; produces upright spikes of small, tubular purple flowers.
Propagation
Easily grown from seeds or by rooting stem cuttings in water or moist soil.
Common pests & issues
Susceptible to aphids, whiteflies, and spider mites. Overwatering can lead to root rot or downy mildew.
Similar species
Sweet Basil (Ocimum basilicum) has rounder, lighter green leaves and green stems. Holy Basil (Tulsi) has a more musky scent and slightly hairy leaves.