Plant Database / Herbs / Thai Basil
Herbs

Thai Basil

Ocimum basilicum thyrsiflora
Lamiaceae (Mint)

Holds up to heat better than sweet basil and brings a licorice note to Southeast Asian cooking.

EdibleAnnualFull sunHeat-loverContainer-friendly
Thai Basil (Ocimum basilicum thyrsiflora) illustration — Texas Roots plant database, by Jordan Polasek
Sun
Full sun
Water
Even
Soil
Rich
pH
6.0–7.0
Hardiness
Warm-season annual
Height
12–18 in
Spacing
10–12 in
Days to harvest
60–80

What it is

Thai Basil (Ocimum basilicum thyrsiflora) is in the Lamiaceae (Mint) family. Holds up to heat better than sweet basil and brings a licorice note to Southeast Asian cooking.

How to grow it

It wants full sun, water it even, and give it rich soil. Target a soil pH around 6.0–7.0. Space plants about 10–12 in apart. Expect roughly 60–80. Warm-season annual.

How it's used

Thai Basil is used: fresh in stir-fry, pho, curries.

🔎 How to identify it

  • Narrow leaves, purple stems
  • Purple flower spikes
  • Anise-licorice scent

Edibility

PartsLeaves
UsesFresh in stir-fry, pho, curries
CautionNone.
The grow guide

How to grow & propagate thai basil

Everything I've worked out about starting this one, keeping it alive through a Texas year, and turning one plant into many — free.

How to propagate thai basil

Almost everything in the mint family roots from cuttings so readily it feels like cheating. Snip a 4–5 inch non-flowering tip, strip the bottom leaves, and either set it in a glass of water on the windowsill or push it straight into damp potting mix. You'll usually see roots in 1–2 weeks. Seed works too, but cuttings give you an exact copy of the parent — which matters when one plant tastes better than its neighbor.

Beginner's path: take more cuttings than you think you need. They're free, they cost you nothing but a few minutes, and the ones that take more than make up for the ones that don't. This is how a single plant becomes a hedge, a row, or a gift for every neighbor on the street.

Growing thai basil in Texas

Give it full sun and rich soil. Match the spot to the plant and most of the battle is already won.

This one thrives in heat that flattens other plants, so it earns its space through a Texas summer. Get it established before the worst of July, keep water steady, and it'll produce when little else will.

In a container it'll dry faster than in the ground, so check the top inch of soil daily in summer; pots on a hot Texas patio can need water every single day.

Harvesting

Figure on roughly 60–80 before you're harvesting. Pick herbs in the morning after the dew dries for the strongest oils, and harvest little and often — regular cutting keeps a herb bushy and stops it bolting. The part you're after: leaves.

Making more for free

Save it the easy way — vegetatively. Because you can clone this plant from a cutting, division, or piece of root, you never have to buy it again: keep one healthy mother plant and make all the copies you want.

🌤 Before you plant: check the live 7-day garden weather to time it right for frost and heat.

Part of the free Texas Roots plant database, compiled by Jordan Polasek from his greenhouse in El Campo, Texas. Free to read and share. If it helped, the best thanks is to grow something.