Generally — Most Areas
sunn hemp (zones 7-11) partially overlaps with Florida (8a-11b). It can grow in zones 8-11 within the state.
Your yard isn't the whole zone.
Sunn Hemp is grown as an annual, so your winter zone isn't the deciding factor — your frost-free window is, and slope, trees, and low spots move the last-frost date across a single yard. Enter your address and we'll score sunn hemp against your parcel's actual frost dates, sun, and soil.
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Zone Comparison
Sunn Hemp Needs
- USDA Zones: 7-11
- Soil pH: 5 - 8.4
- Sun: Full Sun
- Drainage: well (dry spells)
- Frost-Free Days: 60+
Florida Has
- USDA Zones: 8a-11b
- Last Frost: Jan 1 - Mar 15
- First Frost: Nov 15 - never (south FL)
- Annual Rainfall: 50-65 inches
- Common Soils: Sandy, Muck (Everglades), Shell-rock (Keys)
Plant Zone Range (zones 7-11)
Preferred Soil pH
Plant data: USDA PLANTS Database / plant_species_v5.csv. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
Growing Season Fit
Zone compatibility says you can survive winter here. Whether the growing season is long enough — and warm enough — is a different question.
Frost-free days
Sunn Hemp wants 60+ frost-free days; a typical Florida site sees ~320 (NOAA Climate Normals). That leaves comfortable headroom for succession planting.
Growing degree days
Sunn Hemp needs ~2200 GDD (base 50°F) to ripen. The state median runs ~6150 GDD (USDA NRCS county aggregates), so Florida's typical season clears that easily.
Climate aggregates derive from USDA NRCS county-level hardiness data + Cornell CALS Extension GDD-by-region tables + MSU Extension chill-hours-by-zone (1991-2020 NOAA Climate Normals baseline).
Soil + Drainage Fit
Sunn Hemp likes near-neutral soil (pH 5-8.4). That's the common-ground band across Florida's sandy and muck (everglades) — a soil test confirms it for your site. 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.
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.
Sunn Hemp in Florida — Quick Answer
- Verdict: Generally — Most Areas
- Plant Zones: 7-11 (USDA PLANTS Database)
- State Zones: 8a-11b (USDA ARS PHZM 2023)
- Growing Season: Jan 1 - Mar 15 to Nov 15 - never (south FL) (NOAA Climate Normals)
- Days to Maturity: 90 days
What Else to Consider
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
Build organic matter relentlessly — compost and cover crops turn sand into soil that holds both water and food.
Humidity drives fungal diseases (powdery mildew, black spot, rust)
Space plants for airflow, water at the base in the morning, and choose resistant varieties — your extension office lists the proven ones.
Hurricane season (June-November) can destroy plantings
Favor wind-tough perennials, stake young trees properly, and keep fall crops in containers you can move ahead of a storm.
Nematodes are a serious pest in sandy FL soils
Summer solarization and crop-family rotation knock nematodes back — your extension office can confirm the species from a soil sample.
Pollinator + Wildlife Value
Sunn Hemp draws pollinators (moderate value, USDA PLANTS Database). Planting it near vegetable beds can lift fruit set on neighboring crops.
Florida Cooperative Extension
For Florida-specific cultivar recommendations, planting calendars, and pest pressure for sunn hemp, the canonical source is UF/IFAS Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Sunn Hemp native to Florida?
No — the USDA PLANTS Database lists Sunn Hemp 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 Sunn Hemp in Florida
When can I plant Sunn Hemp in Florida?
Florida's last spring frost runs jan 1 - mar 15 and first fall frost nov 15 - never (south fl) (NOAA Climate Normals 1991-2020). Time outdoor planting to after the last-frost window for your specific site, and pull from those dates for transplant scheduling.
What hardiness zone is Sunn Hemp grown in across Florida?
Florida spans USDA hardiness zones 8a-11b (USDA ARS PHZM 2023). Sunn Hemp carries a range of zones 7-11, 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 Climate Normals 1991-2020). Sunn Hemp needs 60+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Sunn Hemp native to Florida?
No — the USDA PLANTS Database lists Sunn Hemp 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 Sunn Hemp in Florida?
Sunn Hemp prefers pH 5-8.4 and well (dry spells) drainage (USDA PLANTS 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 Sunn Hemp actually grow on my specific land in Florida?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores sunn hemp 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 sunn hemp against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
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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