Can I Grow Vietnamese Coriander in Louisiana?

Vietnamese Coriander in Louisiana — the short answer

Louisiana is not one climate

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 vietnamese coriander (USDA PHZM 2023):

Zone Comparison

Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS, and university Extension sources — per-field provenance varies and is published with the dataset. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.

When to Plant Vietnamese Coriander in Louisiana

Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: Growable Ground Plant Database — frost-free days from FAO ECOCROP, days to harvest from university Extension production guides, and growing-degree-day and chill-hour minimums that are compilation estimates rather than published figures. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.

Growing Season Fit

The zone check says vietnamese coriander survives winter in part of Louisiana, not across all of it. Whether the season is long enough — and warm enough — is a different question.

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

Vietnamese Coriander likes near-neutral soil (pH 5.5-7.5). That's the common-ground band across Louisiana's alluvial clay and muck — a soil test confirms it for your site. It will grow across that whole span, but it does best between pH 6 and 7 — worth knowing before you decide whether a Louisiana soil test result is a problem or just a number. Drainage requirement: poorly (saturated >50% of year). A soil-survey lookup (NRCS SSURGO) flags whether your specific site matches. pH range, preferred pH and drainage need: We haven't confirmed this against a published source yet.

Plant pH requirements: FAO ECOCROP and USDA PLANTS, with the remaining rows from other published sources or Growable Ground compilation. Drainage: FAO ECOCROP, with the remaining rows from other published sources or Growable Ground compilation. Louisiana soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.

Before you plant vietnamese coriander for food

Anything you grow to eat takes up what is in the ground it grows in, so what is on record near you is worth knowing before vietnamese coriander goes in. What follows is Louisiana’s documented federal record at state scale — a screening signal, not a soil test, and not a statement about any one lot.

What Else to Consider for Vietnamese Coriander in Louisiana

Zone compatibility tells you about winter cold survival — but Louisiana growers also need to think about:

What to actually do about these — and the constraints that apply to every Louisiana grower, not just vietnamese coriander — is covered on the Louisiana growing guide.

Where in Louisiana Vietnamese Coriander Is Zone-Hardy

Vietnamese Coriander is rated for USDA zones 9–11. 42 of Louisiana’s 64 counties fall inside that band. The coldest that does is Acadia County at zone 9a. 22 counties sit below the plant’s zone 9 floor, where an unprotected plant is relying on snow cover and a mild year. 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 vietnamese coriander 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". Vietnamese Coriander’s zone 9–11 band: Not verified. A parcel report resolves your address’s own zone and frost dates rather than its county’s.

Pollinator + Wildlife Value

Vietnamese Coriander draws honeybees (low value). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, vietnamese coriander 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. Pollinator value: We haven't confirmed this against a published source yet.

Louisiana Cooperative Extension

For Louisiana-specific cultivar recommendations, planting calendars, and pest pressure for vietnamese coriander, the canonical source is LSU AgCenter. Their fact sheets carry the local trial data we can't generalize across 50 states.

Is Vietnamese Coriander native to Louisiana?

No — the USDA PLANTS Database lists Vietnamese Coriander as introduced rather than native in the Lower 48, so it is not part of Louisiana's native flora. It grows here as a garden plant; pairing it with a few Louisiana natives keeps local pollinators fed too.

Looking for plants that belong here? The Louisiana growing guide lists plants that USDA PLANTS records growing in Louisiana and that Kew and NatureServe Explorer both list in its native range, leaving out any that NatureServe flags as exotic there or that our audit holds.

State records: USDA PLANTS Database state-distribution data (presence, not state-level nativity), accessed 2026-10-19.

Common Questions About Growing Vietnamese Coriander in Louisiana