{"id":"rhododendron-macrophylum","license":"CC-BY-4.0","data":{"scientificName":"Rhododendron macrophylum","commonNames":["Pacific Rhododendron*"],"taxonRank":"species","acceptedName":"Rhododendron macrophyllum","family":"Ericaceae","ids":{"usdaSymbol":"RHMA3","gbifKey":7894533,"itisTsn":23720,"wikidataQid":"Q2714739","inatTaxonId":57360},"usdaZoneMin":"7b","zoneSource":"usda-plants","states":["CA","ID","OR","WA"],"hardinessAssertions":[{"minimum":"6","maximum":"9","interpretation":"explicit-range","precision":"whole-zone","zoneMapping":"source-stated","applicability":"applicable","source":"osu-em-9103","sourceTaxon":"Rhododendron macrophyllum","taxonMatch":"exact","sourcePlacement":"Pacific Rhododendron profile (PDF page 143)","sourceVersion":"EM 9103, February 2015","asOf":"2026-08-26T00:00:00.000Z"},{"minimum":"6","maximum":"9","interpretation":"explicit-range","precision":"whole-zone","zoneMapping":"source-stated","applicability":"applicable","source":"pnw-590","sourceRecordId":"broadleaf-evergreens:Pacific rhododendron","sourceTaxon":"Rhododendron macrophyllum","taxonMatch":"accepted-name","sourcePlacement":"Pacific rhododendron profile, USDA hardiness zones field","sourceVersion":"2023-10","asOf":"2026-08-26T00:00:00.000Z"},{"minimum":"7b","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":7,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"RHMA3","sourceTaxon":"Rhododendron macrophylum","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 65367, Temperature, Minimum (°F)","sourceVersion":"PLANTS Help Document 2022; characteristics cache retrieved 2026-08-23","asOf":"2026-08-26T00:00:00.000Z"}],"plantForm":"shrub","matureHeightFt":15,"waterNeed":"high","photo":{"file":"/images/plants/rhododendron-macrophylum.jpg","sourceUrl":"https://www.inaturalist.org/photos/95492564","observationUrl":"https://www.inaturalist.org/observations/59750325","license":"cc-by","attribution":"(c) David Anderson, some rights reserved (CC BY)","fetchedOn":"2026-08-23T00:00:00.000Z"},"evidence":[{"source":"firesmart-bc","verdict":"recommend","verdictRaw":"FireSmart-approved fire-resistant plant","claims":"Flagged by FireSmart BC as needing more research.","url":"https://firesmartbc.ca/landscaping-hub/fire-resistant-plants/","accessedOn":"2026-08-23T00:00:00.000Z"},{"source":"fitzgerald-waldo-2002-osu-frn6","verdict":"recommend","verdictRaw":"Fire-Resistant Plant Materials for Oregon","claims":"Rhododendron macrophyllum (Pacific rhododendron) is listed under “Shrubs—broadleaf evergreen” for Southern and Western Oregon. 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":"Southern and Western 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":"osu-em-9103","verdict":"recommend","verdictRaw":"fire-resistant plants that thrive in Willamette Valley growing conditions","claims":"The shrubs & woody vines profile lists Rhododendron macrophyllum as Pacific Rhododendron. The profile prints USDA Hardiness Zone: 6–9.","plantPart":"whole-plant","sourcePlacement":{"value":"Pacific Rhododendron profile (PDF page 143)","scheme":"osu-em-9103-profile"},"edition":"EM 9103, February 2015","url":"https://www.canbyfire.org/files/074d2a9e3/Fire-Resistant-Plants_Willamette-Valley.pdf","documentDate":"2015-02-01T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"},{"source":"osu-plant-profile-galleries","verdict":"recommend","verdictRaw":"Choose the right broadleaf evergreen plants for your fire-resistant landscape","claims":"The Pacific rhododendron profile prints Rhododendron macrophyllum. The gallery points to PNW 590 for complete details.","plantPart":"whole-plant","sourcePlacement":{"value":"Pacific rhododendron — Rhododendron macrophyllum","scheme":"osu-2023-broadleaf-evergreens-gallery"},"edition":"November 2023 educational gallery","url":"https://extension.oregonstate.edu/gallery/fire-resistant-plant-profiles-broadleaf-evergreens","documentDate":"2023-11-01T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"}],"flammabilityClass":"fire-resistant","ratingReason":"limited-evidence","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":["CA","ID","OR","WA"],"nativeStates":[],"rangeAssertions":[{"relation":"documented-occurrence","geography":{"grain":"state","stateCodes":["CA","ID","OR","WA"]},"provenance":"legacy-field"}],"usdaZoneMin":"7b","usdaZoneMax":null,"hardinessAssertions":[{"minimum":"6","maximum":"9","interpretation":"explicit-range","precision":"whole-zone","zoneMapping":"source-stated","applicability":"applicable","source":"osu-em-9103","sourceTaxon":"Rhododendron macrophyllum","taxonMatch":"exact","sourcePlacement":"Pacific Rhododendron profile (PDF page 143)","sourceVersion":"EM 9103, February 2015","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"},{"minimum":"6","maximum":"9","interpretation":"explicit-range","precision":"whole-zone","zoneMapping":"source-stated","applicability":"applicable","source":"pnw-590","sourceRecordId":"broadleaf-evergreens:Pacific rhododendron","sourceTaxon":"Rhododendron macrophyllum","taxonMatch":"accepted-name","sourcePlacement":"Pacific rhododendron profile, USDA hardiness zones field","sourceVersion":"2023-10","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"},{"minimum":"7b","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":7,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"RHMA3","sourceTaxon":"Rhododendron macrophylum","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 65367, Temperature, Minimum (°F)","sourceVersion":"PLANTS Help Document 2022; characteristics cache retrieved 2026-08-23","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"}],"hardinessSelection":{"status":"overlapping","assertions":[{"minimum":"6","maximum":"9","interpretation":"explicit-range","precision":"whole-zone","zoneMapping":"source-stated","applicability":"applicable","source":"osu-em-9103","sourceTaxon":"Rhododendron macrophyllum","taxonMatch":"exact","sourcePlacement":"Pacific Rhododendron profile (PDF page 143)","sourceVersion":"EM 9103, February 2015","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"},{"minimum":"6","maximum":"9","interpretation":"explicit-range","precision":"whole-zone","zoneMapping":"source-stated","applicability":"applicable","source":"pnw-590","sourceRecordId":"broadleaf-evergreens:Pacific rhododendron","sourceTaxon":"Rhododendron macrophyllum","taxonMatch":"accepted-name","sourcePlacement":"Pacific rhododendron profile, USDA hardiness zones field","sourceVersion":"2023-10","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"},{"minimum":"7b","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":7,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"RHMA3","sourceTaxon":"Rhododendron macrophylum","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 65367, 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":"osu-em-9103","sourceName":"Fire-resistant Landscape Plants for the Willamette Valley (EM 9103)","sourceUrl":"https://www.canbyfire.org/files/074d2a9e3/Fire-Resistant-Plants_Willamette-Valley.pdf","geography":{"grain":"aggregate-region","stateCodes":["OR"],"regions":["Willamette Valley"]},"completeness":"partial","reviewStatus":"reviewed","scope":"OSU Extension says EM 9103 highlights fire-resistant plants that thrive under Willamette Valley growing conditions. FireApproved publishes 172 exact owners only as valley context. The guide shares the PNW 590 lineage and is not a second independent vote or statewide site clearance.","sourceVersion":"OSU-EM-9103-2015-02","asOf":"2015-02-01T00:00:00.000Z"}],"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":"Rhododendron macrophyllum (Pacific rhododendron) is listed under “Shrubs—broadleaf evergreen” for Southern and Western Oregon. The guide says most listed plants require some irrigation during Oregon's dry summer months and must be maintained in a healthy condition.","evidenceIndex":1}]}],"maintenanceAssertions":[],"maintenanceConditions":null,"regulatoryReviews":{},"seedReviews":{}},"legacyCompatibilityProjection":{"nativeStates":[],"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."}