mountain laurel

Kalmia latifolia · Ericaceae · all Kalmia records · also called Mountain-laurel · Wikipedia

Is this one for your yard?

Enter your ZIP to see whether this is legal to plant in your state, and whether it survives your winter.

No.

Mountain laurel is highly flammable, and all six published assessments put it on the avoid side of fire-resistant landscaping.

The strongest reason is not simply agreement among plant lists. The USDA Forest Service Southern Research Station and NIST conducted whole-plant burns using large-scale calorimetry, then placed mountain laurel among the highly flammable shrubs. Their study tested entire plants rather than isolated leaves or twigs, making the result directly relevant to how an ornamental shrub burns.

Extension and Firewise programs across the eastern United States reach the same practical conclusion. NC State rates mountain laurel high in flammability. Ohio State assigns it H on a five-band scale, while Virginia Tech gives it H on a three-band scale. The Forest Service’s eastern plant selector calls it Not Firewise, the most hazardous category on its four-point scale. The scales differ, but each rating means avoid.

Mountain laurel is a native shrub in the heath family that reaches about 12 feet at maturity. Its spring flowers, low water needs, and suitability for part sun may make it appealing, but they do not offset the consistent fire findings. For landscaping near a structure, the evidence supports choosing another shrub and keeping mountain laurel away from the building.

Fire-resistant shrubs instead

Form: shrub
Mature height: ~12 ft
Light: Part sun
Water need: low
Rated in: NC; North Carolina; North Carolina / southeastern US; Ohio / Midwest +4

On this lot

1. Fire evidence and conditions

Fire evidence: Highly flammable — location does not change the cited classification.
Fire-performance conditions
Fire ecology context
Placement evidence: 4 source placement records; source schemes remain separate.
Evidence regions: NC; North Carolina; North Carolina / southeastern US; Ohio / Midwest; Southeast US; Virginia / Mid-Atlantic; eastern US; southeastern US
Maintenance

Typed publication scope: 3 scopes across 3 cited fire sources

Fire-Resistant Landscaping in North Carolina (AG-874) · Official scoped edition
- NC; complete normalized coverage · 2025-03-26
  The complete three-table AG-874 plant list is explicitly for North Carolina and contains 202 low-, medium-, or high-flammability rows. FireApproved accounts for all source rows under its strict taxonomy and lineage rules; source scope does not establish local suitability at a particular North Carolina site.
Firewise Landscaping (OSU Extension Bulletin 921) · Official scoped edition
- OH; partial normalized coverage · 2006-03-01
  Ohio State University Extension Bulletin 921 is an Ohio publication that describes Ohio fire seasons and landscape conditions and labels nativity to Ohio. FireApproved publishes 352 exact source-owning plant records from its eight rated tables. This historical publication scope does not assert current extension endorsement or that a listed plant suits every Ohio site.
Virginia Firescapes — Firewise Landscaping for Woodland Homes (430-300) · Official scoped edition
- VA; partial normalized coverage · 2009-04-15
  Virginia Cooperative Extension's publication opens with Virginia wildfire conditions, identifies its Virginia Firewise Landscaping Task Force, and labels plants native to Virginia. FireApproved publishes 306 exact source owners. Publication scope does not establish parcel suitability or current endorsement of this archived 2009 list.

2. Why this plant is relevant here

State distribution: Documented in AL, CT, DC, DE, FL, GA, IN, KY, LA, MA, MD, ME, MS, NC, NH, NJ, NY, OH, PA, RI, SC, TN, VA, VT, WV.
Native range: Current cited native range in AL, CT, DE, FL, GA, IN, KY, LA, MA, MD, ME, MS, NC, NH, NJ, NY, OH, PA, RI, SC, TN, VA, VT, WV.
Introduced / established
USDA hardiness: Documented minimum 4b; no upper limit is documented.

3. Legal, ecological, and broader status

Legal-list status
Seed-list status
Reported invasive here
Broader regional context
Federal context

How to read this page

The status above is computed from the cited rows below: independent recommendations can support a fire-resistant result, an avoid row can produce keep-away, and disagreement stays visible as conflict. Placement notes preserve each source’s own scheme rather than translating unlike rules into one scale. This is evidence about a plant, not permission to plant it in every part of the defensible space; Zone 0 remains noncombustible.

Native and introduced range evidence

These are exact U.S. botanical-area records from the cited range source. Native and introduced describe biogeographic relationship, not fire performance or planting approval. Doubtful and extinct rows stay visible but do not count as current presence.

Current native

24

exact source areas

Current introduced

0

exact source areas

Qualified

0

doubtful or extinct source rows

24 native source areas · World Checklist of Vascular Plants, version 16 v16, as of 2026-06-04

Alabama (AL)
Connecticut (CT)
Delaware (DE)
Florida (FL)
Georgia (GA)
Indiana (IN)
Kentucky (KY)
Louisiana (LA)
Massachusetts (MA)
Maryland (MD)
Maine (ME)
Mississippi (MS)
North Carolina (NC)
New Hampshire (NH)
New Jersey (NJ)
New York (NY)
Ohio (OH)
Pennsylvania (PA)
Rhode I. (RI)
South Carolina (SC)
Tennessee (TN)
Virginia (VA)
Vermont (VT)
West Virginia (WV)

The lossless worldwide derivative is retained once in the research corpus; object pages repeat only exact U.S. areas needed by the local lens. The JSON twin carries the same page assertions.

Plant hardiness evidence

These values describe the plant source. Your ZIP zone comes from the separate 2023 USDA Plant Hardiness Zone Map. Whole-zone values stay whole-zone, and a single unresolved value is not treated as a tolerance range. Different source boundaries stay separate: overlapping statements are compared independently, while only ranges with no shared zone are called a conflict.

Eastern United States Fire Performance Plant Selector · record kalmia-latifolia · 2016-wayback · as of 2026-08-26

Source prints 4 · single-value meaning unresolved · whole zone precision · source stated

Source taxon: Kalmia latifolia · exact match.

Source location: Cold Hardiness Zone field in the recovered selector record.

Not used for comparison: The recovered selector prints one Cold Hardiness Zone value but does not define it as a minimum threshold or a one-zone range.
USDA PLANTS Database — Plant Characteristics · record KALA · PLANTS Help Document 2022; characteristics cache retrieved 2026-08-23 · as of 2026-08-26

Minimum 4b · no upper limit documented · half zone precision · derived containing band

Exact source measurement: -23°F; mapped only to its containing half-zone.

Source taxon: Kalmia latifolia · source identifier match.

Source location: PlantCharacteristics record 65203, Temperature, Minimum (°F).

Where its sources say to plant it

Placement rules below use each source's own distances or named zones, tied to its rating. They are not interchangeable with the directory's current Zone 0 guidance.

Eastern United States Fire Performance Plant Selector: Landscape Zone 2 — 5–10 ft from the structure; maintained lawn or fuel breaks, with easily ignited evergreens avoided [Fire Performance Plant Selector landscape zone] (with its avoid rating)
Firewise Landscaping: do not plant within 5 ft of structures (keep out of Zone 1) [OSU B921 source-category siting] (with its avoid rating)
Fire in the Wildland-Urban Interface: Selecting and Maint…: avoid in defensible space around homes in high wildfire-risk areas [ufifas-fr147-defensible-space] (with its avoid rating)
North Carolina Extension Gardener Plant Toolbox: kalmia-latifolia [nc-toolbox-flammability-facet] (with its avoid rating)

The evidence

Grouped by what each source concluded. Primary evidence rated the plant itself (a lab, field program, or original curation); corroboration compiled or republished another source's rating and resolves to its root lineage.

Avoids (8)

Eastern United States Fire Performance Plant Selector — USDA Forest Service Northeastern Area S&PF + state Firewise programs (WV, OH, PA, DE, DC, MD, NJ) · 2016-wayback · original source Primary evidence Keyed curation lineage: ufifas-srs-tree

“NOT Firewise (4)”

Outstanding flowers in spring-poisonous foliage making it deer resistant.
Quantifying and ranking the flammability of ornamental shrubs in the southern United States — USDA Forest Service Southern Research Station + NIST (Long, Behm, Zipperer, Hermansen, Maranghides, Mell) · 2006 · original source Primary evidence Lab-tested lineage: ufifas-srs-tree

“High flammability (whole-plant burns, NIST BFRL)”
Firewise Landscaping in North Carolina (E05-44596) — NC State University / NC Cooperative Extension + USFWS (Bardon, Van Druten) · 2005 · original source Primary evidence Expert-curated lineage: nc-tree

“High flammability rating”
Firewise Landscaping (OSU Extension Bulletin 921) — Ohio State University Extension (Sydnor, Steward, Kloss / Ohio DNR Division of Forestry) · 2006 · original source Primary evidence Expert-curated lineage: ufifas-srs-tree

“H flammability”

Leaves are poisonous; requires shade and good drainage; insect and disease sensitive.
Virginia Firescapes — Firewise Landscaping for Woodland Homes (430-300) — Virginia Cooperative Extension / Virginia Tech (Appleton, Frenzel, Hillegass, Lyons, Steward — Virginia Firewise Landscaping Task Force) · 2009 · original source Primary evidence Expert-curated lineage: ufifas-srs-tree

“H flammability”

Leaves are poisonous. Requires shade.
Fire-Resistant Landscaping in North Carolina (AG-874) — NC State Extension (Kays, Fawcett, Query, Thompson-Welch, Bardon) · 2025 · original source Primary evidence Expert-curated lineage: nc-tree resolves to Firewise Landscaping in North Carolina (E05-44596)

“high flammability”
Fire in the Wildland-Urban Interface: Selecting and Maintaining Firewise Plants for Landscaping — UF/IFAS Extension (Doran, Fill, Crandall, Randall, Long) · 2023 · original source Primary evidence Expert-curated lineage: ufifas-srs-tree

“usually highly flammable”

The source says young plants have dense leaves and low branches, while older plants may develop a less-flammable open tree form.

Corroboration (1 rows from 1 source)

North Carolina Extension Gardener Plant Toolbox — plant profiles and flammability ratings — NC State Extension (plants.ces.ncsu.edu) · live facet capture accessed 2026-08-23 · original source Corroboration Expert-curated lineage: nc-tree resolves to Firewise Landscaping in North Carolina (E05-44596)

“high flammability” · original source

NC Toolbox facet capture lists "Kalmia latifolia" under the high flammability tag.

Fire-resistant shrubs instead

highbush blueberry
Vaccinium corymbosum

American witchhazel
Hamamelis virginiana

common winterberry
Ilex verticillata

mapleleaf viburnum
Viburnum acerifolia

New Jersey tea
Ceanothus americanus

common buttonbush
Cephalanthus occidentalis

Fire-resistant shrubs listed above

Guides that discuss this plant

Last verified 2026-08-23. JSON (CC BY 4.0)

Profiles: USDA PLANTS · GBIF · iNaturalist · Wikidata · Wikipedia · ITIS

Kalmia latifolia (Mountain-laurel). FireApproved. https://fireapproved.com/plants/kalmia-latifolia/. Last verified 2026-08-23.

1. Fire evidence and conditions

2. Why this plant is relevant here

3. Legal, ecological, and broader status

Native and introduced range evidence

24

0

0

Plant hardiness evidence

Where its sources say to plant it

The evidence

Avoids (8)

Related plants

Fire-resistant shrubs instead

Guides that discuss this plant