Tatsoi is an annual or biennial grown for its leaves, ready to start cutting about 45 days after sowing. Season length, not a winter zone, decides where it grows. Its late spring flowers are a moderate draw for honeybees and native bees, even though the leaves are the prize. As a brassica (the cabbage family), give it a fresh bed each year — away from where its relatives just grew — so the soil-borne pests and diseases of the family never get a foothold.
Tatsoi — the short answer
Tatsoi: grown in zones 2–11, part sun, pH 5–7, about 45 days to maturity.
- USDA zones
- Grown as an annual — see the growing season
- Growing season, not a hardiness zone
- Soil pH
- 5–7
- We haven't confirmed this against a published source yet.
- Sun
- Part Sun
- We haven't confirmed this against a published source yet.
- Days to Maturity
- 45 days
- We haven't confirmed this against a published source yet.
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS and university Extension sources — each tile names its own row's source, because per-field provenance varies.
Score Tatsoi on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether tatsoi actually takes — and those shift from one yard to the next. Enter your address and we'll score tatsoi against your land's real conditions.
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What Tatsoi is
Tatsoi grows as an annual or biennial and reaches around 8 inches at maturity. It blooms in late spring.
Life cycle, mature height and bloom period: We haven't confirmed this against a published source yet.
How to grow Tatsoi
Season length, not a winter zone, decides where tatsoi grows; it is ready to harvest about 45 days after planting. Tatsoi does best in part sun — at least 4 hours of direct sun a day — and soil from pH 5 to 7, on well-drained ground. It needs around 950 growing degree days to mature and a growing season of at least 40 frost-free days, which is why climate matters as much as soil.
USDA Zones
Grown as an annual — see the growing season
Soil pH
5 - 7
We haven't confirmed this against a published source yet.
Sun
Part Sun
We haven't confirmed this against a published source yet.
Drainage
well (dry spells)
We haven't confirmed this against a published source yet.
Minimum Growing Temperature
50°F
Below this it stops growing rather than dies — a pace limit, not a survival limit.
We haven't confirmed this against a published source yet.
Days to Maturity
45 days
Tatsoi; cool-season Asian green; rosette form.
We haven't confirmed this against a published source yet.
GDD Required
950+
Growing degree-days of accumulated warmth it needs to mature — humid summers reach this faster than cool coastal ones.
We haven't confirmed this against a published source yet.
Mature Height
0.7 ft
We haven't confirmed this against a published source yet.
Frost-Free Days
40+
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 tatsoi in part sun with at least 4 hours of direct sun, once the soil has warmed and frost risk has passed. We haven't confirmed this against a published source yet.
Match the soil
Tatsoi prefers pH 5 to 7. We haven't confirmed this against a published source yet. 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. We haven't confirmed this against a published source yet. A 2–3 inch mulch layer holds moisture without waterlogging.
Harvest at maturity
Tatsoi is ready about 45 days after sowing. We haven't confirmed this against a published source yet. Cut the outer leaves as you need them — frequent harvest keeps new growth coming.
Where Tatsoi thrives
Season length, not a winter zone, decides where tatsoi grows. Zone is only the starting point, though: the soil pH, drainage, and frost dates on your specific land decide how well it actually does.
A USDA zone is a 10°F band of average annual extreme winter minimum, so zones 2–11 spans average winter lows from -50°F to 50°F (USDA PHZM 2023). Across the 50 states and DC, that band covers 48 outright and splits 3 more down the middle.
Zones 2–11·Hardiness bandOpen map →
Continental US shown — Alaska and US Pacific territories sit outside the federal map's polygon dataset.
This map is derived from the USDA ARS / PRISM Plant Hardiness Zone Map (2023) and is not the official USDA Plant Hardiness Zone Map.
Where Tatsoi stands, state by state
Tatsoi is rated for zones 2–11 — a cold floor USDA puts at -50 to -40°F. Across the 50 states and DC, 48 sit fully inside that band, the line runs through 3 more, and 0 sit outside it — and inside every split state, the same line runs on at county grain.
Fully inside zones 2–11
48 states
3 of 48 shown
State zone extents: USDA Plant Hardiness Zone Map (PHZM) 2023. A zone is a 10°F band of average annual extreme minimum temperature, so a state that splits the band contains the boundary — its own page draws the county line, and a parcel report resolves which side your land sits on.
What grows around Tatsoi
Growing guides for tatsoi
In rotation planning, tatsoi counts as a Brassica — beds recover best when brassica crops don’t follow each other in the same spot year over year. (Growable Ground derivation — crop-rotation group from botanical family)
Related plants in vegetable
Good to know
Tatsoi offers moderate value to bees and other pollinators. We haven't confirmed this against a published source yet.
Before you harvest tatsoi, 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 tatsoi for food. Our free screen reads 8 federal source types across roughly 950K 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.
Your land is one point inside Tatsoi's range
This page resolves to the species. Your state page draws the county line, and a report reads the parcel — the soil pH, drainage, sun, and frost dates on your exact ground, which no species average can see.
See if Tatsoi will thrive on your land
Zone averages are a start. Your soil pH, drainage, sun exposure, and frost dates shape whether tatsoi actually takes. We score it against the mapped and modelled 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.
25+ data sources analyzed in seconds
How we know this about Tatsoi
The figures above are cited per row, not per site: the pH band names this plant’s own source column, the three temperature figures each carry their own, and days-to-maturity cites the publication that actually lists it. All of it comes from the Growable Ground Plant Database — a compilation over FAO ECOCROP, USDA PLANTS, and university Extension sources, published openly with per-field provenance.
Grounded inUSDA PLANTS Database
Frequently asked questions
Can I grow Tatsoi in my zone?
Tatsoi is grown as an annual, so a hardiness zone does not decide it — its growing season follows your last and first frost dates. Soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.
How long does Tatsoi take to grow?
Tatsoi is ready to harvest about 45 days after planting. We haven't confirmed this against a published source yet. Your local frost dates and soil temperature move that window earlier or later.
When should you plant Tatsoi?
Most growers plant tatsoi after the last spring frost, once the soil has warmed, leaving enough of the season for its 40-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 Tatsoi need?
Tatsoi does well in partial sun — around 4 hours of direct sun, and it takes some afternoon shade in stride. We haven't confirmed this against a published source yet. That flexibility makes it a good match for a bed the house or a nearby tree shades for part of the day. A Growable Ground report maps how the sun actually falls on your land, hour by hour, so you can set it where the light lines up.
What soil does Tatsoi need?
Tatsoi prefers soil pH 5 to 7, on well-drained ground. We haven't confirmed this against a published source yet. Your report scores your parcel's mapped soil against that using USDA SSURGO data.
Does Tatsoi attract pollinators?
Yes — tatsoi's flowers are a solid nectar source for honeybees and native bees. We haven't confirmed this against a published source yet.
Keep exploring Tatsoi
Tatsoi state by state
Every state tatsoi's zone reaches — 15 link straight to that state's tatsoi growing page; the rest open the state's full growing guide.