Thai Basil is an annual or perennial culinary herb, grown for the flavor it brings to the kitchen, ready to harvest about 65 days after planting. It's hardy across USDA zones 10 through 11, stands up to deer and grows just as well in a container as in the ground. Its summer flowers are a moderate draw for honeybees and native bees, even though the harvest is the prize.
Zones
10-11
pH Range
4.3-8.2
Sun
Full Sun
Days to Maturity
65
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What Thai Basil is
Thai Basil grows as an annual or perennial and reaches around a foot and a half at maturity. It blooms purple in summer. It's also deer-resistant and well suited to containers.
How to grow Thai Basil
Thai Basil grows in USDA zones 10 through 11 and is ready to harvest about 65 days after planting. Thai Basil does best in full sun — at least 6 hours of direct sun a day — and soil from pH 4.3 to 8.2, on well-drained ground. It needs around 1,500 growing degree days to mature and a growing season of at least 80 frost-free days, which is why climate matters as much as soil.
USDA Zones
10-11
USDA PHZM 2023
Soil pH
4.3 - 8.2
USDA PLANTS Database
Sun
Full Sun
Growable Ground plant catalog
Drainage
well (dry spells)
Growable Ground plant catalog
Frost Tolerance
44.6°F
The lowest temperature it shrugs off — below this, expect damage without cover.
Growable Ground plant catalog
Days to Maturity
65 days
Growable Ground plant catalog
GDD Required
1500+
Growing degree-days of accumulated warmth it needs to mature — humid summers reach this faster than cool coastal ones.
Growable Ground plant catalog
Mature Height
1.5 ft
Growable Ground plant catalog
Frost-Free Days
80+
The frost-free stretch it needs start to finish — short-season areas may need an indoor head start.
Growable Ground plant catalog
Start the season right
Plant thai basil in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Thai Basil prefers pH 4.3 to 8.2 (FAO ECOCROP). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.
Water steadily
Keep the root zone evenly moist through establishment. A 2–3 inch mulch layer holds moisture without waterlogging.
Harvest at maturity
Thai Basil is ready about 65 days after planting (University Extension production guides). Snip sprigs as you need them — regular cutting keeps the foliage tender and slows it bolting to flower.
Good to know
Good news for pet owners — thai basil isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Thai Basil offers moderate value to bees and other pollinators. (Source: Pollinator Partnership.)
Before you harvest thai basil, know your soil
Anything you grow to eat takes up what's in the ground it grows in, so it's worth knowing what's documented near you before you plant thai basil for food. Our free screen reads 9 federal source types across roughly 1.8M indexed sites and shows which sit near your address and which way they drain. It's a screening estimate from public records and proximity — not a soil test — so a nearby record means a soil test is worth it, not that your soil is unsafe.
Where Thai Basil thrives
Thai Basil is hardy across USDA zones 10 through 11. Zone is only the starting point, though: the soil pH, drainage, and frost dates on your specific land decide how well it actually does.
Zones 10–11·Where Thai Basil growsOpen map →
On USDA hardiness-zone overlap, Thai Basil can grow in these states:
See if Thai Basil will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether thai basil actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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Frequently Asked Questions
Can I grow Thai Basil in my zone?
Thai Basil grows in USDA hardiness zones 10 through 11 (USDA PHZM 2023). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.
How long does Thai Basil take to grow?
Thai Basil is ready to harvest about 65 days after planting (University Extension production guides). Your local frost dates and soil temperature move that window earlier or later.
When should you plant Thai Basil?
Most growers plant thai basil after the last spring frost, once the soil has warmed, leaving enough of the season for its 80-day frost-free need. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Thai Basil need?
Thai Basil needs full sun — a spot that catches at least 6 hours of direct summer sun a day. In more shade it still grows, but usually gives a smaller, later crop. The catch is that a yard rarely gets even light everywhere — a fence, the house, or one tall tree can quietly take those hours. A Growable Ground report reads the real sun-hours across your land, canopy and buildings included, so you can pick the brightest bed before you plant.
What soil does Thai Basil need?
Thai Basil prefers soil pH 4.3 to 8.2, on well-drained ground (FAO ECOCROP). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Thai Basil attract pollinators?
Yes — thai basil's flowers are a solid nectar source for honeybees and native bees. (Source: Pollinator Partnership.)
Is Thai Basil safe for pets?
Thai Basil is not known to be toxic to dogs or cats based on available data. Always supervise pets around new plantings. (Source: ASPCA.)