{"id":"rhododendron","license":"CC-BY-4.0","data":{"scientificName":"Rhododendron","commonNames":["Pacific rhododendron"],"taxonRank":"genus","acceptedName":"Rhododendron","family":"Ericaceae","ids":{"usdaSymbol":"RHODO","gbifKey":2883026,"itisTsn":23700,"wikidataQid":"Q189393","inatTaxonId":49487},"usdaZoneMin":"6a","usdaZoneMax":"9b","zoneSource":"pnw590","states":["ID","OR","WA"],"hardinessAssertions":[{"minimum":"6","maximum":"9","interpretation":"explicit-range","precision":"whole-zone","zoneMapping":"source-stated","applicability":"applicable","source":"pnw-590","sourceTaxon":"Rhododendron","taxonMatch":"exact","sourcePlacement":"Plant profile USDA hardiness zones field","sourceVersion":"2023-10","asOf":"2026-08-26T00:00:00.000Z"}],"plantForm":"shrub","photo":{"file":"/images/plants/rhododendron.jpg","sourceUrl":"https://www.inaturalist.org/photos/279629539","observationUrl":"https://www.inaturalist.org/observations/161759373","license":"cc-by","attribution":"(c) Tatyana Petrenko, 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":"long-2006-srs","verdict":"mixed","verdictRaw":"Moderate flammability (whole-plant burns, NIST BFRL)","plantPart":"whole-plant","edition":"2006","url":"https://www.srs.fs.usda.gov/pubs/ja/ja_long004.pdf","accessedOn":"2026-08-23T00:00:00.000Z"},{"source":"osu-b921","verdict":"avoid","verdictRaw":"H flammability","claims":"Requires acid, moist, well-drained soils; disease sensitive.","sourcePlacement":{"value":"do not plant within 5 ft of structures (keep out of Zone 1)","scheme":"b921-siting"},"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":"avoid","verdictRaw":"H flammability","claims":"Requires well drained acid soil.","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":"mixed","verdictRaw":"Moderate Flammability","sourcePlacement":{"value":"should be avoided in the Building Protection 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":"firesafe-marin","verdict":"recommend","verdictRaw":"listed as fire-resistant","claims":"Fire Safe Marin lists this taxon among fire-resistant plants common to Marin County.","condition":"irrigated","edition":"2019","url":"https://firesafemarin.org/wp-content/uploads/2021/08/FIRESafe-MARIN_plant-list_2019.pdf","accessedOn":"2026-08-24T00:00:00.000Z"},{"source":"unr-compilation-good-plant-choices","verdict":"mixed","verdictRaw":"listed by at least two sources; reviewers recorded disagreement","claims":"Compilation marks: UCFPL 1997, 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":"king-county-puget-sound-2011","verdict":"recommend","verdictRaw":"Fire-resistant Landscape Plants","claims":"Listed in the source's Shrubs table as Rhododendron spp. (Azaleas, rhododendrons).","edition":"2011","url":"https://your.kingcounty.gov/dnrp/library/water-and-land/forestry/forestfire/FirewisePlantsPugetSoundBasin-2011.pdf","documentDate":"2011-01-01T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"},{"source":"ufifas-for71-fire-in-mind","verdict":"recommend","verdictRaw":"Less-Flammable Plants","claims":"The source's common-name box lists wild azalea. This record preserves only the exact genus-level identity supported by that label.","plantPart":"whole-plant","condition":"green","sourcePlacement":{"value":"inside defensible space","scheme":"ufifas-for71-defensible-space"},"edition":"FOR 71 / EDIS FR076","url":"https://web.archive.org/web/20051230192215/http://edis.ifas.ufl.edu/pdffiles/FR/FR07600.pdf","documentDate":"2001-01-01T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"},{"source":"tadaki-kira-fire-classification","verdict":"mixed","verdictRaw":"中","score":{"value":2,"scale":"tadaki-kira-fire-protection-power-0-3"},"claims":"Table 10-2 prints ツヅジ類 in the medium fire-protection-power class. The Kagoshima reproduction says highly fire-protective trees can slow spread, promote upward dispersal of heat and smoke, and intercept flying embers.","plantPart":"whole-plant","sourcePlacement":{"value":"ツヅジ類 — Table 10-2","scheme":"tadaki-kira-1982-fire-protection-power"},"edition":"Hito to Shinrin (1982), Table 10-2; Kagoshima web reproduction","url":"https://www.pref.kagoshima.jp/ah12/kurashi-kankyo/sumai/kankyo/hoshin3/theme10/273.html","documentDate":"1982-11-01T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"},{"source":"yavapai-34","verdict":"recommend","verdictRaw":"Fire-Resistant Plants","claims":"Listed as Azalea, Rhododendron — Rhododendron sp.. 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":"scfc-fire-smart-plant-list","verdict":"recommend","verdictRaw":"LESS Flammable Plants with some fire resistance","claims":"Listed as Azalea; Rhododendron. The source says highly flammable plants ignite faster and burn readily; less flammable plants have some fire resistance.","plantPart":"whole-plant","sourcePlacement":{"value":"SHRUBS","scheme":"SCFC Fire Smart plant-form sections"},"edition":"2005 brochure","url":"https://www.scfc.gov/wp-content/uploads/2021/03/ignition-resistant-landscaping-plant-list.pdf","documentDate":"2005-01-01T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"}],"flammabilityClass":"fire-resistant","ratingReason":"consensus","recommendation":"on-list","author":"grayson-graham","reviewStatus":"draft","lastVerified":"2026-08-23T00:00:00.000Z","reviewNotes":"Photo auto-selected (top-voted iNat); human review pending."},"localAssessmentInputs":{"stateDistribution":["ID","OR","WA"],"nativeStates":[],"rangeAssertions":[{"relation":"documented-occurrence","geography":{"grain":"state","stateCodes":["ID","OR","WA"]},"provenance":"legacy-field"}],"usdaZoneMin":"6a","usdaZoneMax":"9b","hardinessAssertions":[{"minimum":"6","maximum":"9","interpretation":"explicit-range","precision":"whole-zone","zoneMapping":"source-stated","applicability":"applicable","source":"pnw-590","sourceTaxon":"Rhododendron","taxonMatch":"exact","sourcePlacement":"Plant profile USDA hardiness zones field","sourceVersion":"2023-10","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"}],"hardinessSelection":{"status":"selected","assertion":{"minimum":"6","maximum":"9","interpretation":"explicit-range","precision":"whole-zone","zoneMapping":"source-stated","applicability":"applicable","source":"pnw-590","sourceTaxon":"Rhododendron","taxonMatch":"exact","sourcePlacement":"Plant profile USDA hardiness zones field","sourceVersion":"2023-10","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"},"assertions":[{"minimum":"6","maximum":"9","interpretation":"explicit-range","precision":"whole-zone","zoneMapping":"source-stated","applicability":"applicable","source":"pnw-590","sourceTaxon":"Rhododendron","taxonMatch":"exact","sourcePlacement":"Plant profile USDA hardiness zones field","sourceVersion":"2023-10","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"}]},"invasiveIn":[],"statusAssertions":[],"fireEvidenceClass":"fire-resistant","recommendation":"on-list","fireSourceScopes":[{"source":"firesafe-marin","sourceName":"Fire-Resistant Plants Common to Marin County","sourceUrl":"https://firesafemarin.org/wp-content/uploads/2021/08/FIRESafe-MARIN_plant-list_2019.pdf","geography":{"grain":"aggregate-region","stateCodes":["CA"],"regions":["Marin County"]},"completeness":"partial","reviewStatus":"reviewed","scope":"The publication is explicitly limited to plants common to Marin County. FireApproved publishes 104 exact owners as Marin regional context while retaining its placement, spacing, irrigation, and maintenance boundary. It is not statewide California guidance or parcel suitability.","sourceVersion":"Fire-Safe-Marin-plant-list-2019","asOf":"2019-01-01T00:00:00.000Z"},{"source":"king-county-puget-sound-2011","sourceName":"Firewise Plants for the Puget Sound Basin","sourceUrl":"https://your.kingcounty.gov/dnrp/library/water-and-land/forestry/forestfire/FirewisePlantsPugetSoundBasin-2011.pdf","geography":{"grain":"aggregate-region","stateCodes":["WA"],"regions":["Puget Sound Basin"]},"completeness":"partial","reviewStatus":"reviewed","scope":"King County's current wildfire page links this list for the Puget Sound Basin. FireApproved publishes 82 exact source owners as basin context, not statewide Washington guidance or a site-specific recommendation.","sourceVersion":"King-County-Puget-Sound-Basin-2011","asOf":"2011-01-01T00:00:00.000Z"},{"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":"scfc-fire-smart-plant-list","sourceName":"Landscaping Can Be Attractive & FIREWISE (Fire Smart Plant List for SC)","sourceUrl":"https://www.scfc.gov/wp-content/uploads/2021/03/ignition-resistant-landscaping-plant-list.pdf","geography":{"grain":"state","stateCodes":["SC"]},"completeness":"partial","reviewStatus":"reviewed","scope":"South Carolina Forestry Commission publishes this explicitly as its Fire Smart Plant List for South Carolina. FireApproved publishes 63 exact genus owners from 72 unique common-name labels; unsafe common-name mappings and duplicates are not broadened. The brochure calls the list non-inclusive and does not establish species-level or site-specific suitability.","sourceVersion":"SCFC-Fire-Smart-Plant-List-2005"},{"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":"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":"ufifas-for71-fire-in-mind","verdict":"recommend","url":"https://web.archive.org/web/20051230192215/http://edis.ifas.ufl.edu/pdffiles/FR/FR07600.pdf","claims":"The source's common-name box lists wild azalea. This record preserves only the exact genus-level identity supported by that label.","evidenceIndex":8}]},{"condition":"irrigated","evidence":[{"source":"firesafe-marin","verdict":"recommend","url":"https://firesafemarin.org/wp-content/uploads/2021/08/FIRESafe-MARIN_plant-list_2019.pdf","claims":"Fire Safe Marin lists this taxon among fire-resistant plants common to Marin County.","evidenceIndex":5}]}],"maintenanceAssertions":[],"maintenanceConditions":null,"regulatoryReviews":{},"seedReviews":{}},"legacyCompatibilityProjection":{"nativeStates":[],"invasiveIn":[],"usdaZoneMin":"6","usdaZoneMax":"9"},"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."}