The Story
Plant Bio
Aromatic herb known for its culinary uses.
'Siam Queen' is an All-America Selections winner noted for its attractive, dark purple stems and flower bracts, compact growth, and spicy, anise-clove fragrance.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Annual
Height
18 inches
Width
15 inches
Light
Full Sun, Partial Sun
Zones
10
Water
Moderate
Humidity
Moderate
Lifespan
Tender perennial, typically grown as an annual
Native To
Southeast Asia
Toxicity
Non-toxic
Bloom period
Mid-summer – Late summer
In flower about 2 months of the year
Planting
How to Grow
- Tuck seeds into moist soil in early spring for best germination.
- Mist cuttings regularly to keep humidity high during rooting.
- Transplant seedlings when they are 3 inches tall and danger of frost has passed.
- Fertilize every 4-6 weeks with a balanced organic fertilizer.
- Prune regularly to encourage bushier growth and prevent flowering.
- Harvest leaves as needed, ideally in the morning for best flavor.
Pro Tip
Use well-draining, rich soil and plenty of sunlight for vigorous growth.
Keep It Thriving
Care Guide
Do
- Provide at least 6 hours of direct sunlight daily ☀️
- Keep soil consistently moist but not waterlogged 💧
- Prune regularly to promote bushiness and prevent flowering 🌿
- Use organic fertilizers to enhance flavor and growth
- Mulch to retain soil moisture and suppress weeds
Don't
- Avoid overwatering to prevent root rot ❌
- Don’t let soil dry out completely between waterings
- Avoid exposing plants to frost ❄️
- Don’t overcrowd plants, ensure good air circulation
- Refrain from using chemical pesticides unnecessarily
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fertilize | ||||||||||||
| Harvest | ||||||||||||
| Pinch | ||||||||||||
| Plant |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Thai Basil questions
What zones can Thai Basil grow in?
Thai Basil is hardy in USDA Zone 10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Thai Basil deer resistant?
Yes — Thai Basil is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Thai Basil bloom?
Thai Basil typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Thai Basil need full sun?
Thai Basil does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
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Keep exploring
Explore the genus
Hardy in your zone?
Grow Thai Basil with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.