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Thai Basil    

Ocimum basilicum var. thyrsiflora

'Thai Basil' is a plant in the Ocimum genus with a scientific name of Ocimum basilicum var. thyrsiflora. The botanical name epithet for Thai Basil (basilicum) means 'royal or king-like'.

Thai basil is a cultivated type of basil bred specifically for its ability to handle the sustained high heats of cooking – making it understandably an excellent choice for south east asian cookery.

Blooms appear in these approximate colours:   Light pastel purple. Leaves appear approximately as a   Android robot green and   Light pastel purple

It is a flowering edible herb that typically grows as an annual/perennial, which is defined as a plant that can matures and completes its lifecycle over the course of one year or more.

Thai Basil is known for its forb habit and growing to a height of approximately 80.0 cm (2.60 feet).

This plant is a great attractor for bees, so if you are looking to attract wildlife Thai Basil is a great choice.

Popular varieties of Thai Basil with home gardeners are Siam Queen, Thai Sweet, Thai Holy Kaprao, Queenette and Horapha rau que.

Thailand is believed to be where Thai Basil originates from.

Thai Basil is normally fairly low maintenance and is normally quite easy to grow, as long as a level of basic care is provided throughout the year. Being aware of the basic soil, sun and water preferences will result in a happier and healthier plant.

This plant info is provided by the myfolia gardener's wiki. All details about Thai Basil have been kindly provided by our members.

How to grow Thai Basil

  • Full Sun

  • Medium

Keep well watered and fertilized. Pinch growing tips to force it to grow bushy. Keep flowers pinched off for best leaf production. This plant seems to prefer hot, humid conditions.

Try to plant in a location that enjoys full sun and remember to water moderately. Use Zone 10 - Zone 11 as your guideline for the appropriate climate for this plant. Ideally plant in loamy soil and try to keep the ph of your soil between the range of 6.1 and 7.5 as Thai Basil likes to be in weakly acidic soil - weakly alkaline soil. Keep in mind when planting that Thai Basil is thought of as tender, so remember to wait until your soil is warm and the night time temperature is well above freezing before moving outside.

See our list of companion Plants for Thai Basil to see which plants you should plant in close proximity to encourage growth.

Growing Thai Basil from seed

Easiest to grow from cuttings. Put a cutting in water after removing some lower leaves. The nodes will grow roots in water. When roots are more than an inch long, pot it in soil.

Try to aim for a seed spacing of at least 0.5 inches (1.27 cm) and sow at a depth of around 0.12 inches (0.3 cm). Soil temperature should be kept higher than 15°C / 59°F to ensure good germination.

By our calculations*, you should look at sowing Thai Basil about 42 days before your last frost date .

Transplanting Thai Basil

Plant out when air and soil temperatures are warm.

Ensure that temperatures are mild and all chance of frost has passed before planting out, as Thai Basil is a tender plant.

Harvesting Thai Basil

Cut and come again.

How long does Thai Basil take to grow?

These estimates for how long Thai Basil takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.

Start logging and journaling your observations to participate!

Days to Germination How long does it take Thai Basil to germinate?
7 days

Average 7 days | Min 3 days | Max 18 days (35)

Days to Transplant How long until I can plant out Thai Basil?
+ 30 days

Average 30 days | Min 21 days | Max 62 days (7)

Days to Maturity How long until Thai Basil is ready for harvest / bloom?
+ 92 days

Average 92 days | Min 74 days | Max 110 days (8)

Total Growing Days How long does it take to grow Thai Basil?
= 129 days

When should I plant Thai Basil?

Our when to plant Thai Basil estimates are relative to your last frost date.

Enter your frost dates and we'll calculate your sowing and planting dates for you!

When to sow The number of days to sow Thai Basil before or after your last frost date.
42 days before Last Frost Date

Other names for Thai Basil

Horapha, bai horapha (Thai), โหระพา (Thai)

Ocimum basilicum var. horapha, Ocimum basilicum 'Horapha', Ocimum tenuiflorum

Latest Thai Basil Reviews

  • Beautiful green-and—maroon foliage on bushy productive plants. Delicious basil flavor with a hint of anise.

    5 stars

    mpsprengeler about growing Basil 'Siam Queen'
  • Beautiful, vigorous and yummy.

    4 stars

    KathN about growing Thai Basil

See all Thai Basil reviews and experiences »


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