Basil Thai

Ocimum basilicum var. thyrsiflorum

herb

verifiedReviewed by the GreenScout Team

Thai basil is a heat-loving culinary herb with narrow, purple-tinged leaves and distinctive anise-clove flavour. It thrives in warm conditions and produces attractive purple flower spikes used in Asian cuisine, particularly Thai and Vietnamese dishes. This variety is more robust than sweet basil and tolerates hot, humid climates.

Common Problems

Select the problem your Basil Thai is experiencing to get a treatment guide.

trending_down

Wiltingchevron_right

warning

Yellow Leaveschevron_right

hourglass_bottom

Slow Growthchevron_right

scatter_plot

Brown Spotschevron_right

south_west

Dropping Leaveschevron_right

Care Guide

light_mode

Light

Full sun (6–8 hours daily); requires intense light for best flavour development.

water_drop

Water

Keep soil evenly moist during growing season; water when top inch feels dry. Reduce in cooler months.

compost

Soil

Well-draining, fertile soil with pH 6.0–7.0; enriched with compost or potting mix.

science

Fertiliser

Light to moderate feeder; apply balanced liquid fertilizer (5–5–5) every 2–3 weeks during active growth.

thermometer

Temperature

Thrives at 70–85°F (21–29°C); slow growth below 60°F (15°C). Highly frost-sensitive.

humidity_percentage

Humidity

Moderate to high humidity (50–70%); mist leaves occasionally but avoid wetting foliage at night to prevent fungal issues.

Toxicity

check_circleSafe for Catscheck_circleSafe for Dogscheck_circleSafe for Children

Safe for all. Contains estragole in small amounts; safe for culinary use in normal quantities.

Common Diseases

spaPowdery Mildewchevron_right grainLeaf Spotchevron_right spaBotrytis Blightchevron_right

Common Pests

blur_onAphidschevron_right pest_controlSpider Miteschevron_right pest_controlWhiteflieschevron_right pest_controlThripschevron_right

Seasonal Care

local_floristspring

Resume regular watering and feeding as growth picks up.

light_modesummer

Peak growing season. Water and feed regularly.

ecoautumn

Reduce watering as growth slows. Stop heavy feeding.

ac_unitwinter

Minimal watering and feeding. Protect from frost if needed.

Frequently Asked Questions

Is Thai Basil more heat-tolerant than regular basil?

Yes — it's more robust than sweet basil and tolerates hot, humid climates well, thriving at 70–85°F where other basils might struggle.

What gives Thai Basil its distinctive flavor?

Its narrow, purple-tinged leaves carry a distinctive anise-clove flavor unlike sweet basil, which is why it's central to Thai and Vietnamese dishes rather than Italian cooking.