green ash

Fraxinus pennsylvanica · Oleaceae · all Fraxinus records · Wikipedia

Fire-resistant. Recommended by 3 independent evidence lineages with no objection on record across 19 cited sources. This status is computed from the cited evidence by the published rule, never hand-assigned. The page keeps its cited source rows visible for readers and separates each evidence channel from the computed result on this record.

▲ the Eastern US Fire Performance Plant Selector ▲ North Carolina's Bardon 2005 list ▲ Fire-Resistant Plants for Montana Landscapes ◆ New Zealand's FENZ laboratory directory · fire-tested ◆ Shoot flammability patterns in native and exotic street t… · fire-tested

Computed class: Fire-resistant (consensus) — derived from the cited evidence by a published rule, never hand-assigned. Each chip above is one independent primary-evidence lineage and its direction. No plant is fireproof; condition and placement govern. Zone 0 is hardscape regardless.

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Fraxinus pennsylvanica cites Shoot flammability patterns in native and exotic street tree species as its selected laboratory lineage. The irrigated condition remains attached under test conditions, keeping the study setting with the source rather than generalizing it across the record.

Two hardiness assertions remain in hardiness evidence, while both native and introduced relationships are cited in range evidence. The evidence table preserves the fire rows, related plants keeps comparisons separate, and the existing genus page organizes other records for Fraxinus. Each path separately answers a different part of the planting decision.

Form: tree
Mature height: ~50 ft
Light: Full sun
Water need: moderate
Rated in: Arizona above 3,000 feet / interior Southwest; Black Hills, South Dakota; British Columbia; Central Coast, New South Wales, Australia +12

On this lot

1. Fire evidence and conditions

Fire evidence: Fire-resistant — location does not change the cited classification.
Fire-performance conditions: 1 condition stated in cited fire-evidence rows.
Fire ecology context
Placement evidence: 5 source placement records; source schemes remain separate.
Evidence regions: Arizona above 3,000 feet / interior Southwest; Black Hills, South Dakota; British Columbia; Central Coast, New South Wales, Australia; Global; Maine; Maryland, New Jersey, and West Virginia; Montana / Northern Rockies; NC; Nevada / Great Basin; New Zealand; North Carolina; North Carolina / southeastern US; Ohio / Midwest; Virginia / Mid-Atlantic; eastern US
Maintenance

Typed publication scope: 11 scopes across 9 cited fire sources

Firewise Plant Material for the Black Hills · Official scoped edition
- Black Hills (SD footprint); partial normalized coverage
  The page explicitly limits itself to the Black Hills, and NFPA Firewise's archived 2006 plant-list index files it under South Dakota. FireApproved publishes 47 exact genus or species owners from 48 printed rows. This is bounded Black Hills context, not statewide South Dakota coverage or a finding that a plant suits a particular site.
Firewise Landscaping Plants (Maryland, New Jersey, and West Virginia editions) · Official scoped edition
- MD; partial normalized coverage · 2015-01-08
  Maryland Forest Service says the list contains plants that can be grown in Maryland and identifies Maryland natives. FireApproved publishes 169 exact source owners from the 180 printed rows; an unrepresentable form and duplicate-owner rows are not broadened. The list calls itself non-comprehensive and does not establish suitability for every Maryland site.
- NJ; partial normalized coverage
  New Jersey DEP publishes a state edition saying the listed plants can be grown in New Jersey and are relatively resistant to fire. Its same 180 printed taxon occurrences map to the 169 conservative owners already normalized for the template family. The list is non-comprehensive and does not establish suitability for every New Jersey site or override the Pinelands Commission's separate placement and fuel-break rules.
- WV; partial normalized coverage · 2026-08-26
  West Virginia Division of Forestry publishes a state edition saying the listed plants can be grown in West Virginia and are relatively resistant to fire. Its same 180 printed taxon occurrences map to the 169 conservative owners already normalized for the template family. The list is non-comprehensive and provides no comparative or site-specific rating.
Maine fire-resistant plant list · Official scoped edition
- ME; partial normalized coverage · 2013-10-23
  Maine Forest Service presents a partial list for landscaping 30-100 feet from a structure. FireApproved publishes only 39 unique exact current/accepted matches plus Rhus typhina from the source's explicit parenthetical; unresolved, abbreviated, misspelled, absent, and duplicate-owner rows remain held.
Fire-Resistant Plants for Montana Landscapes (MontGuide MT200101AG) · Official scoped edition
- MT; partial normalized coverage · 2022-04-01
  The April 2022 MontGuide explicitly presents fire-resistant species adapted to Montana. FireApproved publishes 92 exact plant records from the source while retaining excluded genus, family, and unresolved rows; the guide itself says not every listed species grows in every part of the state.
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.
FIREWISE Plant Materials for 3,000 ft. and Higher Elevations (AZ1289) · Official scoped edition
- Arizona at or above 3,000 feet (AZ footprint); partial normalized coverage · 2011-12-01
  AZ1289 is explicitly limited to Arizona elevations of 3,000 feet and higher. FireApproved publishes 69 exact owners as regional Arizona context, retaining every water and elevation condition. It is never promoted to statewide low-desert guidance or an independent Tier 1 vote.
A Compilation of Good Plant Choices for Nevada's High Fire Hazard Areas (SP-05-16) · Official scoped edition
- NV; partial normalized coverage · 2005-01-01
  University of Nevada Cooperative Extension compiled plants suited to Nevada climate zones and reported favorably by at least two upstream firewise lists. FireApproved publishes 126 exact source owners at Nevada publication scope. The source explicitly makes no independent flammability determination, so these rows remain corroborative.
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, AR, CO, CT, DC, DE, FL, GA, IA, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NY, OH, OK, PA, RI, SC, SD, TN, TX, UT, VA, VT, WI, WV, WY.
Native range: Current cited native range in AL, AR, CO, CT, DC, DE, FL, GA, IA, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NY, OH, OK, PA, RI, SC, SD, TN, TX, UT, VA, VT, WI, WV, WY.
Introduced / established: 1 sourced range or established record. This is not an invasive warning.
USDA hardiness: Documented minimum 2a; 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

42

exact source areas

Current introduced

1

exact source area

Qualified

0

doubtful or extinct source rows

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

Alabama (AL)
Arkansas (AR)
Colorado (CO)
Connecticut (CT)
District of Columbia (DC)
Delaware (DE)
Florida (FL)
Georgia (GA)
Iowa (IA)
Illinois (IL)
Indiana (IN)
Kansas (KS)
Kentucky (KY)
Louisiana (LA)
Massachusetts (MA)
Maryland (MD)
Maine (ME)
Michigan (MI)
Minnesota (MN)
Missouri (MO)
Mississippi (MS)
Montana (MT)
North Carolina (NC)
North Dakota (ND)
Nebraska (NE)
New Hampshire (NH)
New Jersey (NJ)
New York (NY)
Ohio (OH)
Oklahoma (OK)
Pennsylvania (PA)
Rhode I. (RI)
South Carolina (SC)
South Dakota (SD)
Tennessee (TN)
Texas (TX)
Utah (UT)
Virginia (VA)
Vermont (VT)
Wisconsin (WI)
West Virginia (WV)
Wyoming (WY)

1 introduced source area · World Checklist of Vascular Plants, version 16 v16, as of 2026-06-04

New Mexico (NM)

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 fraxinus-pennsylvanica · 2016-wayback · as of 2026-08-26

Source prints 5 · single-value meaning unresolved · whole zone precision · source stated

Source taxon: Fraxinus pennsylvanica · 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 FRPE · PLANTS Help Document 2022; characteristics cache retrieved 2026-08-23 · as of 2026-08-26

Minimum 2a · no upper limit documented · half zone precision · derived containing band

Exact source measurement: -47°F; mapped only to its containing half-zone.

Source taxon: Fraxinus pennsylvanica · source identifier match.

Source location: PlantCharacteristics record 49774, Temperature, Minimum (°F).

Conditions in the fire evidence

These describe tested or rated plant material. They are not horticultural maintenance instructions.

irrigated: Shoot flammability patterns in native and exotic street tree species at the WUI of eastern Australia evidence row

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 3 — 10–30 ft from the structure; thin vegetation, remove debris, and minimize plant massing [Fire Performance Plant Selector landscape zone] (with its recommendation)
North Carolina Extension Gardener Plant Toolbox: fraxinus-pennsylvanica [nc-toolbox-flammability-facet] (with its recommendation)
Firewise Landscaping Plants: Deciduous Trees [Maryland Firewise plant-form tables] (with its recommendation)
Firewise Plant Material for the Black Hills: Large shrubs & trees [black-hills-plant-form-table] (with its recommendation)
Maine fire-resistant plant list: Trees, page 1: Green ash - Fraxinus pennsylvanica [Maine Forest Service list section and page] (with its recommendation)

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.

Mid-scale / conditional (2)

Low Flammability Plants directory — Fire and Emergency New Zealand (plant flammability testing at Lincoln University) · 2026 · original source Primary evidence Lab-tested lineage: lincoln-nz-tree

“Moderate/high flammability”

Moderate/high flammability classification.
Shoot flammability patterns in native and exotic street tree species at the WUI of eastern Australia — Fire (Huber-Smith, Morley, Krix, Murray et al.; University of Technology Sydney) · 2023 · original source Primary evidence Lab-tested lineage: uts-murray-tree

“Measured; four flammability-attribute rankings were not concordant” · condition: irrigated

Shoot time-to-flame, flame duration, flaming events, and flame temperature were compared without an overall class.

Listed without a rating (4)

Corroboration (4 rows from 1 source)

FLAMITS: FLAMmability plant traiTS database — Dryad / Global Ecology and Biogeography · Dryad version 9 · original source Corroboration Trait database lineage: meta-aggregator

4 cited rows from this source; its identity, lineage and tier are stated once.
- Primary study Cui2020a: Cui, X., Paterson, A. M., Wyse, S. V., Alam, M. A., Maurin, K. J. L., Pieper, R., ... Curran, T. J. (2020a). Shoot flammability of vascular plants is phylogenetically conserved and related to habitat fire-proneness and growth form. Nature Plants, 6, 355-359.
  
  Shared row context: plant part branches; fuel all; predrying yes; device grill; site Cui2020a-1; sampling ND.
  - “ignition frequency (%): 100”
    
    FLAMITS record 1394; Ignitability measurement.
  - “maximum sample temperature (°C): 554.3”
    
    FLAMITS record 1588; Combustibility measurement.
  - “burning duration (s): 28.3”
    
    FLAMITS record 1782; Sustainability measurement.
  - “estimated burnt biomass (%): 47.5”
    
    FLAMITS record 1976; Consumability measurement.

Guides that discuss this plant

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

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

Fraxinus pennsylvanica (Green ash). FireApproved. https://fireapproved.com/plants/fraxinus-pennsylvanica/. Last verified 2026-08-23.