Generally — Most Areas
blue lobelia (zones 4-9) suits most of Louisiana (8b-10b) — zones 8-9 are in range, and the rest of the state is the exception.
Your yard isn't the whole zone.
Louisiana spans zones 8b-10b, but your yard sits in exactly one — and slope, tree cover, and cold-air pockets nudge it further. Enter your address and we'll score blue lobelia against your parcel's actual hardiness, soil, and sun.
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Zone Comparison
Blue Lobelia Needs
- USDA Zones: 4-9
- Mature size: 3 ft tall
- Picking window: ~30 days of harvest
- Drought tolerance: Low
Louisiana Has
- USDA Zones: 8b-10b
- Last Hard Freeze (28°F): Jan 30 - Feb 17
- First Hard Freeze (28°F): Nov 30 - Dec 8
- Annual Rainfall: 50-65 inches
- Common Soils: Alluvial clay, Muck, Sandy loam
Plant Zone Range (zones 4-9)
Plant data: USDA PLANTS Database / Growable Ground plant catalog. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Blue Lobelia in Louisiana
The frost window
Across Louisiana, the last spring hard freeze (28°F) clears between Jan 30 and Feb 17, and the first fall hard freeze lands between Nov 30 and Dec 8 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 286-day window you can count on — up to 312 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.
Winter standing
Louisiana runs as cold as USDA zone 8, and no sourced winter-hardiness floor is on record for blue lobelia, so this page does not state whether it overwinters here — and gives no fall establishment date on the strength of a guess. Whether blue lobelia is a permanent planting or a replant-every-spring crop for you turns on your own zone within Louisiana; check its hardiness range against that before treating it as long-lived ground.
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.
Blue Lobelia in Louisiana — Quick Answer
- Verdict: Generally — Most Areas
- Plant Zones: 4-9 (USDA PLANTS Database)
- State Zones: 8b-10b (USDA ARS PHZM 2023)
- Growing Season: 28°F hard freezes about Jan 30 - Feb 17 to Nov 30 - Dec 8 (NOAA Regional Climate Centers ACIS, 1991-2020)
What Else to Consider for Blue Lobelia in Louisiana
Zone compatibility tells you about winter cold survival — but Louisiana growers also need to think about:
Extreme humidity and rainfall promote rot and fungal diseases
Poor drainage in delta and coastal areas
Hurricane damage risk from June through November
What to actually do about these — and the constraints that apply to every Louisiana grower, not just blue lobelia — is covered on the Louisiana growing guide.
Where in Louisiana Blue Lobelia Is Zone-Hardy
Blue Lobelia is rated for USDA zones 4–9. 51 of Louisiana’s 64 counties fall inside that band. The coldest that does is Bienville County at zone 8b. 13 counties sit above its zone 9 ceiling, where the limit is too little winter chill rather than too much cold. Where you are in Louisiana decides this one.
Across those 64 counties Louisiana’s winter-low ladder runs from zone 8b in Bienville County to zone 10a in Plaquemines County — 1.5 USDA zones of spread, which is 15°F between the two counties’ average coldest night of the year. That is why a statewide hardiness answer is where you start and not where you finish.
The planting window moves with it. Claiborne County holds its last hard freeze (28°F) until about Mar 2, while St. Bernard County is clear by Jan 16 — 45 days apart. Set blue lobelia out on your county’s date, not the state’s.
County hardiness zones: USDA Plant Hardiness Zone Map (PHZM) 2023, per county. County last-freeze dates: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F killing freeze — earlier than the folk 32°F "last frost". Blue Lobelia’s zone 4–9 band: USDA PLANTS / Growable Ground plant database. A parcel report resolves your address’s own zone and frost dates rather than its county’s.
Where in Louisiana Fits Best
Even within Louisiana's zones 8b-10b, county microclimates differ enough to change what thrives. These counties carry the closest zone match for blue lobelia (USDA PHZM 2023):
Pollinator + Wildlife Value
Blue Lobelia draws native bees, butterflies, and hummingbirds (high value, Growable Ground Plant Database). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, blue lobelia can only work that bloom inside Louisiana's frost window — roughly 298 days, opening after the last 28°F freeze (Jan 30 - Feb 17) and closing at the first (Nov 30 - Dec 8), per NOAA Regional Climate Centers ACIS, 1991-2020.
Louisiana Cooperative Extension
For Louisiana-specific cultivar recommendations, planting calendars, and pest pressure for blue lobelia, the canonical source is LSU AgCenter. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Blue Lobelia native to Louisiana?
Yes — the USDA PLANTS Database (accessed 2026-07-01) documents Blue Lobelia as native to Louisiana. Planting it supports the pollinators and wildlife that evolved alongside it.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Blue Lobelia in Louisiana
When can I plant Blue Lobelia in Louisiana?
Louisiana's last spring hard freeze (28°F) clears between Jan 30 and Feb 17, and the first fall hard freeze lands between Nov 30 and Dec 8 (NOAA Regional Climate Centers ACIS, 1991-2020). No sourced winter-hardiness floor is on record for Blue Lobelia, so this page does not state whether it overwinters in Louisiana and publishes no fall establishment date for it — check its hardiness range against your own zone before treating it as a permanent planting.
What hardiness zone is Blue Lobelia grown in across Louisiana?
Louisiana spans USDA hardiness zones 8b-10b (USDA ARS PHZM 2023). Blue Lobelia carries a range of zones 4-9, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical Louisiana site have?
A typical Louisiana site sees ~298 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Blue Lobelia should be matched against that window, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Blue Lobelia native to Louisiana?
Yes — the USDA PLANTS Database (accessed 2026-07-01) documents Blue Lobelia as native to Louisiana. Planting it supports the pollinators and wildlife that evolved alongside it.
Will Blue Lobelia actually grow on my specific land in Louisiana?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores blue lobelia 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 Louisiana
State-level data is a sketch. Your Growable Ground report scores blue lobelia against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your lot that Louisiana blue lobelia averages can't show:
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Growing guides for blue lobelia
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