Thai Basil

Herbaceous

Thai Basil

Ocimum basilicum var. thyrsiflorum

Also known as: Horapha, Anise basil

Herbaceous Lamiaceae EdiblePollinatorPest Management
Hardiness Zone
9-11
Ideal Temp
65–90°F
Survives Down To
32°F
Life Cycle
Annual

Thai basil is the liquorice-mint square-stemmed workhorse of stir-fries and phở—purple stems, pointed leaves, and flower spikes bees treat like a runway. Distinct from sweet basil; do not substitute unless you enjoy flavor chaos. Grow spring through fall; bolts in heat but keeps producing if you steal tips. Frost ends the party—extend with row cover or pots. ☀️💧 Sun and Water Requirements: Full sun, rich well-drained soil, steady moisture. Wilts fast in pots—mulch and check daily in August. ✂️ Propagation: Seed indoors after last frost or direct sow warm soil; cuttings root in water in a week if you forget to label them. 🌾 Harvest / Best Use Timing: Pinch tips and flower spikes for continuous kitchen harvest until frost stops growth.

Good Neighbors
  • Tomatoes
  • Eggplant
  • Peppers
Cautions
  • Cold wet soil at germination
  • Dense shade
Known Threats — Organic Solutions Only
Aphids
Aphidoidea
Japanese Beetles
Popillia japonica
Whiteflies
Aleyrodidae