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triacanthos","taxonMatch":"exact","sourcePlacement":"Table 1, tree row","sourceVersion":"New, January 2007","asOf":"2026-08-26T00:00:00.000Z"},{"minimum":"3","maximum":"9","interpretation":"explicit-range","precision":"whole-zone","zoneMapping":"source-stated","applicability":"applicable","source":"pnw-590","sourceTaxon":"Gleditsia triacanthos","taxonMatch":"exact","sourcePlacement":"Plant profile USDA hardiness zones field","sourceVersion":"2023-10","asOf":"2026-08-26T00:00:00.000Z"},{"minimum":"4a","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":-30,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"GLTR","sourceTaxon":"Gleditsia triacanthos","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 79383, Temperature, Minimum (°F)","sourceVersion":"PLANTS Help Document 2022; characteristics cache retrieved 2026-08-23","asOf":"2026-08-26T00:00:00.000Z"}],"plantForm":"tree","matureHeightFt":70,"waterNeed":"low","photo":{"file":"/images/plants/gleditsia-triacanthos.jpg","sourceUrl":"https://www.inaturalist.org/photos/1509476","observationUrl":"https://www.inaturalist.org/observations/1195024","license":"cc-by","attribution":"(c) Lisa Bennett, some rights reserved (CC BY)","fetchedOn":"2026-08-23T00:00:00.000Z"},"evidence":[{"source":"pnw-590","verdict":"recommend","verdictRaw":"listed fire-resistant","edition":"2023","url":"https://extension.oregonstate.edu/catalog/pub/pnw-590-fire-resistant-plants-home-landscapes","documentDate":"2023-10-01T00:00:00.000Z","accessedOn":"2026-08-23T00:00:00.000Z"},{"source":"wa-dnr-eastern-wa","verdict":"recommend","verdictRaw":"listed fire-resistant","url":"https://www.dnr.wa.gov/publications/rp_fire_resistant_plants_guide_easternwa.pdf","accessedOn":"2026-08-23T00:00:00.000Z"},{"source":"fps-eastern-us","verdict":"recommend","verdictRaw":"Firewise (1)","claims":"Branched thorns on species-landscape forms do not have thorns-many large seed pods on species.","sourcePlacement":{"value":"LZ3","scheme":"fps-landscape-zone"},"edition":"2016-wayback","accessedOn":"2026-08-23T00:00:00.000Z"},{"source":"osu-b921","verdict":"recommend","verdictRaw":"L flammability","claims":"Tolerates drought, soil salts, and high pH. Use thornless forms, as thorns are dangerous.","edition":"2006","url":"http://web.archive.org/web/20070714035936/http://www.firewise.org/usa/files/ohio_plantlist.pdf","accessedOn":"2026-08-23T00:00:00.000Z"},{"source":"va-firescapes","verdict":"recommend","verdictRaw":"L flammability","claims":"Tolerates drought, soil salts and high pH. Use thornless forms, as thorns are dangerous.","edition":"2009","url":"http://web.archive.org/web/20090709143736/http://pubs.ext.vt.edu/430/430-300/430-300.pdf","accessedOn":"2026-08-23T00:00:00.000Z"},{"source":"tfs-fire-resisting","verdict":"avoid","verdictRaw":"High Flammability","sourcePlacement":{"value":"remove from the Building Protection Zone; avoid in the Fuel Modified Zone","scheme":"tfs-bpz"},"edition":"2017","url":"https://www.fire.tas.gov.au/mysite/publications/1709%20Brochure.pdf","accessedOn":"2026-08-23T00:00:00.000Z"},{"source":"firesmart-bc","verdict":"recommend","verdictRaw":"FireSmart-approved fire-resistant plant","sourcePlacement":{"value":"suitable for HIZ extended zone and beyond","scheme":"firesmart-hiz"},"original":"pnw-590","url":"https://firesmartbc.ca/landscaping-hub/fire-resistant-plants/","accessedOn":"2026-08-23T00:00:00.000Z"},{"source":"lsu-hammond","verdict":"recommend","verdictRaw":"recommended for firewise landscaping in Louisiana","edition":"c. 2005-2010","url":"https://www.lsuagcenter.com/portals/our_offices/research_stations/hammond/features/research-updates/firewise-landscaping","accessedOn":"2026-08-23T00:00:00.000Z"},{"source":"idaho-firewise-master-db","verdict":"mixed","verdictRaw":"fire-resistance score 4 of 10","score":{"value":4,"scale":"idaho-0-10"},"sourcePlacement":{"value":"plantable at 70' from home","scheme":"idaho-distance"},"url":"https://idahofirewise.org/wp-content/uploads/2017/04/FireXResistanceXofXPlantsXMasterXDatabase.pdf","accessedOn":"2026-08-23T00:00:00.000Z"},{"source":"unr-compilation-good-plant-choices","verdict":"recommend","verdictRaw":"listed by at least two cited sources","claims":"Compilation marks: AZ1289, CSU 6.305, UI Bulletin 67, OSU FRN 6.","edition":"SP-05-16 (2005)","url":"https://extension.unr.edu/publication.aspx?PubID=4762","documentDate":"2005-01-01T00:00:00.000Z","accessedOn":"2026-08-24T00:00:00.000Z"},{"source":"ua-az1289","verdict":"recommend","verdictRaw":"listed FIREWISE plant material","claims":"Listed among fire-resistant plant materials for Arizona above 3,000 feet. Source table spelling: Gleditsia tricanthos.","edition":"2011 revision","url":"https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1289.pdf","documentDate":"2011-12-01T00:00:00.000Z","accessedOn":"2026-08-24T00:00:00.000Z"},{"source":"msu-e2948","verdict":"recommend","verdictRaw":"considered wildfire-resistant and are recommended for Michigan’s climate","claims":"Table 1 row: Gleditsia triacanthos (Honeylocust).","edition":"New, January 2007","url":"https://web.archive.org/web/20070714035839/http://www.firewise.org/usa/files/mi_wildfire_resistant.pdf","documentDate":"2007-01-01T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"},{"source":"fitzgerald-waldo-2002-osu-frn6","verdict":"recommend","verdictRaw":"Fire-Resistant Plant Materials for Oregon","claims":"Gleditsia triacanthos (Honeylocust) is listed under “Trees—deciduous”. The guide says most listed plants require some irrigation during Oregon's dry summer months and must be maintained in a healthy condition.","plantPart":"whole-plant","condition":"green","sourcePlacement":{"value":"Oregon","scheme":"osu-frn6-oregon-regions"},"edition":"Forest Resource Note No. 6","url":"https://www.iatp.org/sites/default/files/Fire_Resistant_Plants_for_Oregon_Home_Landscap.pdf","documentDate":"2002-04-01T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"},{"source":"girona-pirojardineria-2020","verdict":"avoid","verdictRaw":"DESACONSEJADA","claims":"Gleditsia triacanthos is rated “DESACONSEJADA” by the guide's qualitative IUF garden-suitability method. The method assumes species-specific care and integrates fire evidence with fuel structure, maintenance, origin, invasiveness, and expert fire-service experience.","sourcePlacement":{"value":"not suitable inside the 25-metre maximum-risk zone","scheme":"girona-2020-iuf-25m-suitability"},"edition":"2020 Spanish edition","url":"https://interior.gencat.cat/web/.content/home/030_arees_dactuacio/bombers/foc_forestal/publicacions_tecniques_i_normativa/guies_tecniques/prevencio_i_extincio/2020_Guia_de_pirojardineria_es.pdf","documentDate":"2020-01-01T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"},{"source":"yavapai-34","verdict":"recommend","verdictRaw":"Fire-Resistant Plants","claims":"Listed as Honey Locust — Gleditsia triacanthos. The bulletin says fire-resistant plants tend to resist ignition when irrigated and maintained, while fire-prone plants may ignite readily and burn intensely.","plantPart":"whole-plant","edition":"v1.2","url":"https://www.extension.arizona.edu/sites/default/files/2025-03/FirewisePlants3-14-2025.pdf","documentDate":"2025-03-14T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"},{"source":"firewise-black-hills-sd-plantlist","verdict":"recommend","verdictRaw":"Large shrubs & trees: Honeylocust — Gleditsia triacanthos","claims":"The introduction describes all table entries as fire-resistive plants that can be used in landscaping.","plantPart":"whole-plant","sourcePlacement":{"value":"Large shrubs & trees","scheme":"black-hills-plant-form-table"},"edition":"2004 scan / 2007 archive","url":"https://web.archive.org/web/20070714035957/http://www.firewise.org/usa/files/south_dakota.pdf","documentDate":"2004-11-30T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"},{"source":"firewise-arkansas-plant-guide","verdict":"recommend","verdictRaw":"Gleditsia triacanthos — Thornless honeylocust — Tolerates drought, soil salts and high pH.","claims":"The page presents this row in its table of Firewise trees, shrubs, and groundcovers from which homeowners can choose.","plantPart":"whole-plant","sourcePlacement":{"value":"Scientific name / Common name / Comments table","scheme":"arkansas-firewise-table"},"edition":"2007 one-page guide","url":"https://web.archive.org/web/20070714035825/http://www.firewise.org/usa/files/ArkansasPlantGuide.pdf","documentDate":"2007-05-04T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"}],"flammabilityClass":"fire-resistant","ratingReason":"majority","recommendation":"on-list","author":"grayson-graham","reviewStatus":"draft","lastVerified":"2026-08-23T00:00:00.000Z","reviewNotes":"Demoted from on-list 2026-08-23 (Phase 1 lineage audit): evidence rows do not span two verified lineage trees. 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triacanthos","taxonMatch":"exact","sourcePlacement":"Table 1, tree row","sourceVersion":"New, January 2007","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"},{"minimum":"3","maximum":"9","interpretation":"explicit-range","precision":"whole-zone","zoneMapping":"source-stated","applicability":"applicable","source":"pnw-590","sourceTaxon":"Gleditsia triacanthos","taxonMatch":"exact","sourcePlacement":"Plant profile USDA hardiness zones field","sourceVersion":"2023-10","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"},{"minimum":"4a","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":-30,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"GLTR","sourceTaxon":"Gleditsia triacanthos","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 79383, Temperature, Minimum (°F)","sourceVersion":"PLANTS Help Document 2022; characteristics cache retrieved 2026-08-23","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"}]},"invasiveIn":[],"statusAssertions":[],"fireEvidenceClass":"fire-resistant","recommendation":"on-list","fireSourceScopes":[{"source":"firewise-black-hills-sd-plantlist","sourceName":"Firewise Plant Material for the Black Hills","sourceUrl":"https://web.archive.org/web/20070714035957/http://www.firewise.org/usa/files/south_dakota.pdf","geography":{"grain":"aggregate-region","stateCodes":["SD"],"regions":["Black Hills"]},"completeness":"partial","reviewStatus":"reviewed","scope":"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.","sourceVersion":"firewise-black-hills-scan-2004-11-30"},{"source":"idaho-firewise-master-db","sourceName":"Fire Resistance of Plants Master Database","sourceUrl":"https://idahofirewise.org/wp-content/uploads/2017/04/FireXResistanceXofXPlantsXMasterXDatabase.pdf","geography":{"grain":"aggregate-region","stateCodes":["ID"],"regions":["Southern Idaho"]},"completeness":"partial","reviewStatus":"reviewed","scope":"The official database labels itself \"For Southern Idaho\" and describes Idaho residents at the urban-rangeland interface. FireApproved publishes 419 existing plant owners that cite its scored rows. This bounded Southern Idaho scope is regional context, not statewide coverage or a conclusion that the score transfers unchanged to every Idaho site.","sourceVersion":"Idaho-Firewise-Southern-Idaho-Master-2013-11-08","asOf":"2013-11-08T00:00:00.000Z"},{"source":"lsu-hammond","sourceName":"Firewise Landscaping (Hammond Research Station)","sourceUrl":"https://www.lsuagcenter.com/portals/our_offices/research_stations/hammond/features/research-updates/firewise-landscaping","geography":{"grain":"state","stateCodes":["LA"]},"completeness":"partial","reviewStatus":"reviewed","scope":"LSU AgCenter calls these 31 ornamentals commonly used in Louisiana and recommended for Louisiana firewise landscaping efforts. FireApproved publishes 31 exact source owners, mostly at the source's genus grain. Undocumented curation remains corroborative and is not site suitability.","sourceVersion":"LSU-Hammond-Firewise-Landscaping-2008-12-02","asOf":"2008-12-02T00:00:00.000Z"},{"source":"msu-e2948","sourceName":"Wildfire-resistant Landscape Plants for Michigan (Extension Bulletin E2948)","sourceUrl":"https://web.archive.org/web/20070714035839/http://www.firewise.org/usa/files/mi_wildfire_resistant.pdf","geography":{"grain":"state","stateCodes":["MI"]},"completeness":"partial","reviewStatus":"reviewed","scope":"Michigan State University Extension Bulletin E2948 is explicitly a list of wildfire-resistant landscape plants for Michigan and includes a Michigan-native field. FireApproved publishes 221 exact GBIF owners from 226 represented source rows and holds 15 complex or non-exact rows. This dated publication scope is not a current site-suitability determination.","sourceVersion":"MSU-Extension-E2948-2007","asOf":"2007-01-01T00:00:00.000Z"},{"source":"osu-b921","sourceName":"Firewise Landscaping (OSU Extension Bulletin 921)","sourceUrl":"http://web.archive.org/web/20070714035936/http://www.firewise.org/usa/files/ohio_plantlist.pdf","geography":{"grain":"state","stateCodes":["OH"]},"completeness":"partial","reviewStatus":"reviewed","scope":"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.","sourceVersion":"OSU-Extension-Bulletin-921-2006","asOf":"2006-03-01T00:00:00.000Z"},{"source":"pnw-590","sourceName":"Fire-Resistant Plants for Home Landscapes (PNW 590)","sourceUrl":"https://extension.oregonstate.edu/catalog/pub/pnw-590-fire-resistant-plants-home-landscapes","geography":{"grain":"state","stateCodes":["ID","OR","WA"]},"completeness":"partial","reviewStatus":"reviewed","scope":"The October 2023 joint Pacific Northwest Extension publication explicitly names Oregon, Washington, and Idaho and publishes more than 150 plant profiles. FireApproved has normalized 155 exact plant records from the source; publication scope does not assert that every listed plant suits every site within the three states.","sourceVersion":"PNW-590-October-2023","asOf":"2023-10-01T00:00:00.000Z"},{"source":"ua-az1289","sourceName":"FIREWISE Plant Materials for 3,000 ft. and Higher Elevations (AZ1289)","sourceUrl":"https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1289.pdf","geography":{"grain":"aggregate-region","stateCodes":["AZ"],"regions":["Arizona at or above 3,000 feet"]},"completeness":"partial","reviewStatus":"reviewed","scope":"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.","sourceVersion":"UA-Extension-AZ1289-2011-12","asOf":"2011-12-01T00:00:00.000Z"},{"source":"unr-compilation-good-plant-choices","sourceName":"A Compilation of Good Plant Choices for Nevada's High Fire Hazard Areas (SP-05-16)","sourceUrl":"https://extension.unr.edu/publication.aspx?PubID=4762","geography":{"grain":"state","stateCodes":["NV"]},"completeness":"partial","reviewStatus":"reviewed","scope":"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.","sourceVersion":"UNR-Extension-SP-05-16-2005","asOf":"2005-01-01T00:00:00.000Z"},{"source":"va-firescapes","sourceName":"Virginia Firescapes — Firewise Landscaping for Woodland Homes (430-300)","sourceUrl":"http://web.archive.org/web/20090709143736/http://pubs.ext.vt.edu/430/430-300/430-300.pdf","geography":{"grain":"state","stateCodes":["VA"]},"completeness":"partial","reviewStatus":"reviewed","scope":"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.","sourceVersion":"Virginia-VCE-430-300-2009","asOf":"2009-04-15T00:00:00.000Z"},{"source":"wa-dnr-eastern-wa","sourceName":"Fire-Resistant Plants for Eastern Washington","sourceUrl":"https://dnr.wa.gov/publications/rp_fire_resistant_plants_guide_easternwa.pdf","geography":{"grain":"aggregate-region","stateCodes":["WA"],"regions":["Eastern Washington"]},"completeness":"partial","reviewStatus":"reviewed","scope":"Washington DNR publishes the guide for Eastern Washington and says it compiles plants from other Firewise documents that are likely to thrive there. FireApproved publishes 46 exact owners only as eastern Washington context. The rows are corroborative, not empirical or statewide.","sourceVersion":"WA-DNR-Eastern-Washington-live-2026-08-26"},{"source":"yavapai-34","sourceName":"Fire-Resistant and Fire-Prone Plants Common to Yavapai County (Bulletin 34)","sourceUrl":"https://www.extension.arizona.edu/sites/default/files/2025-03/FirewisePlants3-14-2025.pdf","geography":{"grain":"aggregate-region","stateCodes":["AZ"],"regions":["Yavapai County"]},"completeness":"partial","reviewStatus":"reviewed","scope":"University of Arizona Cooperative Extension authors Bulletin 34 for Yavapai County. FireApproved publishes 198 exact source owners from its resistant and prone tables and keeps the county boundary visible. County publication scope is regional Arizona context, never statewide scope.","sourceVersion":"UA-Yavapai-Bulletin-34-v1.2-2025-03-14","asOf":"2025-03-14T00:00:00.000Z"}],"firePerformanceConditions":[{"condition":"green","evidence":[{"source":"fitzgerald-waldo-2002-osu-frn6","verdict":"recommend","url":"https://www.iatp.org/sites/default/files/Fire_Resistant_Plants_for_Oregon_Home_Landscap.pdf","claims":"Gleditsia triacanthos (Honeylocust) is listed under “Trees—deciduous”. The guide says most listed plants require some irrigation during Oregon's dry summer months and must be maintained in a healthy condition.","evidenceIndex":12}]}],"maintenanceAssertions":[],"maintenanceConditions":null,"regulatoryReviews":{},"seedReviews":{}},"legacyCompatibilityProjection":{"nativeStates":["AL","AR","CT","DC","DE","FL","GA","IA","IL","IN","KS","KY","LA","MA","MD","ME","MI","MN","MO","MS","NC","ND","NE","NH","NJ","NV","NY","OH","OK","PA","RI","SC","SD","TN","TX","UT","VA","VT","WI","WV","WY"],"invasiveIn":[]},"localAssessmentContract":"Compare each dimension separately. State noxious-weed seed designations are material-scoped and never become non-seed plant restrictions, ecological-invasive findings, nursery restrictions, alternatives, product evidence, or fire votes. Introduced/established context is not an invasive warning. Minimum-only hardiness has no inferred maximum; canonical source-temperature conversion is validated and contradictory applicable rows project no primary zone. L48 context applies only to conterminous states and is never exact-state status. Fire-performance conditions are not maintenance advice. FEIS fire-ecology context does not vote in the plant classification. Absence of a status row is not regulatory clearance."}