Yes — Strong Match
shiso is grown as an annual, so season length decides it here, not a winter zone — and Florida's typical season runs ~320 frost-free days against the ~80 shiso needs.
Sow by about Oct 4
Shiso is grown as an annual, so what decides it here is season length, not a winter zone. It needs about 80 frost-free days and a typical Florida season runs ~320 frost-free days, leaving 240 days of slack. That is room to sow as late as about Oct 4 and still finish before the usual first freeze (Dec 13), or to run a second succession.
Want more weeks at either end of that window? How to buy the weeks →
80 frost-free days required against Florida’s ~320-day season. NOAA Regional Climate Centers ACIS 1991-2020 (28°F killing freeze), state median across counties, via stateClimateData.ts.
Your yard isn't the whole zone.
Shiso is grown as an annual, so your winter zone isn't the deciding factor — your frost-free window is. A typical Florida site runs ~320 frost-free days, but that is a state median, not your yard: slope, trees, and low spots move the last-frost date across a single parcel. Enter your address and we'll score shiso against your land's actual frost dates, sun, and soil.
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Zone Comparison
Shiso Needs
- USDA Zones: Data pending
- Frost-Free Days: 80+
- Sun: Full Sun
- Mature size: 2 ft tall
- Picking window: ~60 days of harvest
- Drought tolerance: High
Florida Has
- USDA Zones: 8b-12a
- Last Hard Freeze (28°F): Jan 25 - Feb 10
- First Hard Freeze (28°F): Dec 7 - Dec 18
- Annual Rainfall: 50-65 inches
- Common Soils: Sandy, Muck (Everglades), Shell-rock (Keys)
Preferred Soil pH
Plant data: USDA PLANTS Database / Growable Ground plant catalog. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Shiso in Florida
The frost window
Across Florida, the last spring hard freeze (28°F) clears between Jan 25 and Feb 10, and the first fall hard freeze lands between Dec 7 and Dec 18 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 300-day window you can count on — up to 327 days on a mild site in a kind year. That marks the hard freeze, not the last light frost, so tender transplants usually wait another 2-3 weeks.
When to start the seed
Those dates are when shiso goes out, not when it starts. It is sown under cover about 4 weeks ahead, so counting back from Florida's late-side last freeze of Feb 10 is what fixes your sowing date — and a yard that clears frost earlier than the state's late date starts earlier still.
Days to maturity vs. the window
At 70 days to maturity (USDA PLANTS Database), counting from the last hard freeze it ripens with 230 days to spare even in Florida's tightest freeze scenario — room for a later start or a second sowing.
Timing tuned to sub-state frost dates — Holmes County, not the statewide average.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: USDA PLANTS Database. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
Frost-free days
Shiso wants 80+ frost-free days; a typical Florida site sees ~320 (NOAA Regional Climate Centers ACIS, 1991-2020). That leaves comfortable headroom for succession planting.
Growing degree days
Shiso needs ~1400 GDD (base 50°F) to ripen. The state median runs ~7743 GDD (from PRISM 1991-2020 climate normals), so Florida's typical season clears that easily.
GDD and chill-hour figures are computed from PRISM 1991-2020 monthly climate normals; frost-free days from NOAA Regional Climate Centers ACIS, 1991-2020. Each is the state median across its counties (P25/P75 span the within-state spread). Hardiness-zone range is USDA PHZM 2023.
Soil + Drainage Fit
Shiso likes near-neutral soil (pH 5.5-7.5). That's the common-ground band across Florida's sandy and muck (everglades) — a soil test confirms it for your site. It will grow across that whole span, but it does best between pH 5.5 and 6 — worth knowing before you decide whether a Florida soil test result is a problem or just a number. Drainage matters: this plant wants well (dry spells). If your Florida site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Your land, not the state average
SSURGO maps about 44.6% of Florida as poorly or somewhat-poorly drained, and the class flips parcel to parcel. Shiso tolerates drought well, so wet feet — not dry spells — is its real risk here — your soil map unit, not the state average, is the real answer.
Check your parcel → Source: USDA NRCS SSURGO.
Plant pH and drainage requirements from USDA PLANTS Database. Florida soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Shiso in Florida — Quick Answer
- Verdict: Yes — Strong Match
- Plant Zones: Data pending (USDA PLANTS Database)
- State Zones: 8b-12a (USDA ARS PHZM 2023)
- Growing Season: 28°F hard freezes about Jan 25 - Feb 10 to Dec 7 - Dec 18 (NOAA Regional Climate Centers ACIS, 1991-2020)
- Days to Maturity: 70 days
What Else to Consider for Shiso in Florida
Zone compatibility tells you about winter cold survival — but Florida growers also need to think about:
Sandy soils drain too fast and hold few nutrients — frequent fertilization needed
Humidity drives fungal diseases (powdery mildew, black spot, rust)
Hurricane season (June-November) can destroy plantings
Nematodes are a serious pest in sandy FL soils
Growing shiso here specifically
Shiso roots run medium and prefer pH 5.5–7.5, but drainage comes first here: SSURGO maps about 44.6% of Florida as poorly or somewhat-poorly drained, and wet ground rots its crown before pH ever matters.
Plant shiso on a raised, gravel-amended berm so water drains fast and the crown stays dry. How to handle it →
What to actually do about these — and the constraints that apply to every Florida grower, not just shiso — is covered on the Florida growing guide.
Timing shifts within Florida
Florida isn't one climate. In Holmes County, the last hard freeze (28°F) holds until about Feb 20 — roughly 16 days later than the recorded state median — so plant shiso to your county's window, not the statewide date.
Shiso needs about 80 days of frost-free season to complete its cycle. Even Holmes County — Florida’s shortest season at 281 frost-free days — clears that by 201 days, so season length isn’t the constraint anywhere in Florida. What varies is your own parcel.
Across Florida’s 67 counties the frost-free season runs from 281 days in Holmes County to 365 days in Sarasota County — a spread of 84 days, which is why a single statewide planting date misleads. The median Florida county sees 320 frost-free days, leaving shiso about 240 days of slack on a typical parcel — room for a second sowing where the season runs long.
County last-freeze dates and frost-free day counts: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F freeze (earlier than the folk 32°F "last frost"). Shiso's 80-day requirement: USDA PLANTS / Growable Ground plant database (minimum frost-free days). A parcel report resolves your address's own frost dates.
Pollinator + Wildlife Value
Shiso draws honeybees (low value, Growable Ground Plant Database). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, shiso can only work that bloom inside Florida's frost window — roughly 320 days, opening after the last 28°F freeze (Jan 25 - Feb 10) and closing at the first (Dec 7 - Dec 18), per NOAA Regional Climate Centers ACIS, 1991-2020.
Good to Know Before You Plant Shiso
Shiso is listed as toxic to dogs, cats (all) at a mild level (Cornell). Most listed plants only cause brief upset — a raised bed or a fenced corner usually keeps curious pets clear. Worth knowing for placement: in Florida this is a one-season plant and the first hard freeze (Dec 7 - Dec 18) takes it down, so the exposure above is a summer-long one rather than something standing in the bed all year.
Recommended Shiso Varieties for Florida
Florida publishes no state variety trial for shiso, so we won't invent a "best for Florida" list. Choose types rated to your USDA hardiness zone (8b-12a), and confirm winter survival and drainage against your own parcel.
Florida Cooperative Extension
For Florida-specific cultivar recommendations, planting calendars, and pest pressure for shiso, the canonical source is UF/IFAS Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Shiso native to Florida?
No — the USDA PLANTS Database lists Shiso as introduced rather than native in the Lower 48, so it is not part of Florida's native flora. It grows here as a garden plant; pairing it with a few Florida natives keeps local pollinators fed too.
Looking for plants that belong here? The Florida growing guide lists USDA-documented natives for the state.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Shiso in Florida
When can I plant Shiso in Florida?
Florida's last spring hard freeze (28°F) clears between Jan 25 and Feb 10, and the first fall hard freeze lands between Dec 7 and Dec 18 (NOAA Regional Climate Centers ACIS, 1991-2020). Time outdoor planting to after the last hard freeze for your specific site — a further two to three weeks for anything tender — and count back from those dates for transplant scheduling.
Can Shiso mature before first frost in Florida?
Yes — Shiso matures in 70 days (USDA PLANTS Database), and Florida's dependable hard-freeze-free window runs 300 days (NOAA Regional Climate Centers ACIS, 1991-2020), leaving 230 days of margin. Plant once the last hard freeze has passed — two to three weeks later for anything tender — and it ripens ahead of the first fall freeze.
What hardiness zone is Shiso grown in across Florida?
Florida spans USDA hardiness zones 8b-12a (USDA ARS PHZM 2023). Shiso carries a range of zones Data pending, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Florida site have?
A typical Florida site sees ~320 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Shiso needs 80+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date. In cooler counties like Holmes, the freeze-free season runs shorter than the state average, so verify your own county's window.
Is Shiso native to Florida?
No — the USDA PLANTS Database lists Shiso as introduced rather than native in the Lower 48, so it is not part of Florida's native flora. It grows here as a garden plant; pairing it with a few Florida natives keeps local pollinators fed too.
How should I amend the soil for Shiso in Florida?
Shiso prefers pH 5.5-7.5 and well (dry spells) drainage (Growable Ground Plant Database). That sits in the common-ground band across Florida soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Shiso actually grow on my specific land in Florida?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores shiso against your address's exact soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in Florida
State-level data is a sketch. Your Growable Ground report scores shiso against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your lot that Florida shiso averages can't show:
We read public map data around Florida — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Florida shiso average
Explore More
Growing guides for shiso
Analysis by the Growable Ground research team, grounded in USDA PLANTS, USDA NRCS SSURGO, NOAA Climate Normals (1991-2020), and named Cooperative Extension sources. How we know →
Cite this dataset
Kirchick, M. (2026). Growable Ground Plant Database [Data set]. Zenodo. https://doi.org/10.5281/zenodo.21435643
Licensed CC BY-NC 4.0. DOI 10.5281/zenodo.21435643
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