{"id":"hydrangea-macrophylla","license":"CC-BY-4.0","data":{"scientificName":"Hydrangea macrophylla","commonNames":["Hydrangea"],"taxonRank":"species","acceptedName":"Hydrangea macrophylla","family":"Hydrangeaceae","ids":{"usdaSymbol":"HYMA7","gbifKey":2985994,"itisTsn":565616,"wikidataQid":"Q159219","inatTaxonId":122034},"usdaZoneMin":"6a","zoneSource":"fps-2016","states":["DC","DE","MD","NJ","OH","PA","WV"],"rangeAssertions":[{"relation":"introduced","geography":{"grain":"state","stateCodes":["AR"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 78 — Southeastern U.S.A.","TDWG level 3 ARK — Arkansas"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"}],"hardinessAssertions":[{"minimum":"6","interpretation":"ambiguous-single-value","precision":"whole-zone","zoneMapping":"source-stated","applicability":"uncertain","applicabilityNotes":"The recovered selector prints one Cold Hardiness Zone value but does not define it as a minimum threshold or a one-zone range.","source":"fps-eastern-us","sourceRecordId":"hydrangea-macrophylla","sourceTaxon":"Hydrangea macrophylla","taxonMatch":"exact","sourcePlacement":"Cold Hardiness Zone field in the recovered selector record","sourceVersion":"2016-wayback","asOf":"2026-08-26T00:00:00.000Z"},{"minimum":"5b","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":-13,"unit":"degrees-fahrenheit"},"applicability":"uncertain","applicabilityNotes":"USDA PLANTS provides no duration for this record, so perennial hardiness applicability is unresolved.","source":"usda-plants-characteristics","sourceRecordId":"HYMA7","sourceTaxon":"Hydrangea macrophylla","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 88406, Temperature, Minimum (°F)","sourceVersion":"PLANTS Help Document 2022; characteristics cache retrieved 2026-08-23","asOf":"2026-08-26T00:00:00.000Z"}],"plantForm":"shrub","matureHeightFt":4,"sun":"part","waterNeed":"low","photo":{"file":"/images/plants/hydrangea-macrophylla.jpg","sourceUrl":"https://www.inaturalist.org/photos/439784619","observationUrl":"https://www.inaturalist.org/observations/246357496","license":"cc-by","attribution":"(c) Claude Kolwelter, some rights reserved (CC BY)","fetchedOn":"2026-08-23T00:00:00.000Z"},"evidence":[{"source":"fps-eastern-us","verdict":"recommend","verdictRaw":"Firewise (1)","claims":"Pink flowers in alkaline soils-blue flowers in acidic soils-flowers on new wood.","sourcePlacement":{"value":"LZ2","scheme":"fps-landscape-zone"},"edition":"2016-wayback","accessedOn":"2026-08-23T00:00:00.000Z"},{"source":"long-2006-srs","verdict":"recommend","verdictRaw":"Low 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":"recommend","verdictRaw":"L flammability","claims":"Plant parts are poisonous; tolerates shade.","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":"Plant parts are poisonous. Tolerates shade.","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":"recommend","verdictRaw":"Low Flammability","sourcePlacement":{"value":"acceptable 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":"ut-sp685","verdict":"recommend","verdictRaw":"listed Firewise plant","original":"va-firescapes","url":"https://utia.tennessee.edu/publications/wp-content/uploads/sites/269/2023/10/SP685.pdf","accessedOn":"2026-08-23T00:00:00.000Z"},{"source":"girona-pirojardineria-2020","verdict":"recommend","verdictRaw":"RECOMENDADA","claims":"Hydrangea macrophylla is rated “RECOMENDADA” 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":"suitable inside or outside 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":"tadaki-kira-fire-classification","verdict":"mixed","verdictRaw":"中","score":{"value":2,"scale":"tadaki-kira-fire-protection-power-0-3"},"claims":"Table 10-2 prints アジサイ 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":"アジサイ — 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":"mdfs-firewise-landscaping-plants","verdict":"recommend","verdictRaw":"relatively resistant to fire","claims":"Listed as Hydrangea macrophylla (Bigleaf Hydrangea). The source says listed species exhibit stronger resistance to ignition by wildfires. Source comments: Plants are poisonous. Tolerates shade","plantPart":"whole-plant","sourcePlacement":{"value":"Deciduous Shrubs","scheme":"Maryland Firewise plant-form tables"},"edition":"2015 archived PDF","url":"https://web.archive.org/web/20250408035155/https://dnr.maryland.gov/forests/documents/fire/firewise_plants.pdf","documentDate":"2015-01-08T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"},{"source":"canberra-plant-selector","verdict":"recommend","verdictRaw":"Fire Retardant — Yes — Hydrangea x macrophylla","claims":"The live Canberra Plant Selector marks “Hydrangea x macrophylla” as “Fire Retardant: Yes.”","plantPart":"whole-plant","sourcePlacement":{"value":"filtered result page 9","scheme":"canberra-selector"},"edition":"live tool capture 2026-08-25","url":"https://plantselector.com.au/browse-plants/?fire_retardant%5B0%5D=1","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":["DC","DE","MD","NJ","OH","PA","WV"],"nativeStates":[],"rangeAssertions":[{"relation":"introduced","geography":{"grain":"state","stateCodes":["AR"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 78 — Southeastern U.S.A.","TDWG level 3 ARK — Arkansas"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"documented-occurrence","geography":{"grain":"state","stateCodes":["DC","DE","MD","NJ","OH","PA","WV"]},"provenance":"legacy-field"}],"usdaZoneMin":"6a","usdaZoneMax":null,"hardinessAssertions":[{"minimum":"6","interpretation":"ambiguous-single-value","precision":"whole-zone","zoneMapping":"source-stated","applicability":"uncertain","applicabilityNotes":"The recovered selector prints one Cold Hardiness Zone value but does not define it as a minimum threshold or a one-zone range.","source":"fps-eastern-us","sourceRecordId":"hydrangea-macrophylla","sourceTaxon":"Hydrangea macrophylla","taxonMatch":"exact","sourcePlacement":"Cold Hardiness Zone field in the recovered selector record","sourceVersion":"2016-wayback","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"},{"minimum":"5b","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":-13,"unit":"degrees-fahrenheit"},"applicability":"uncertain","applicabilityNotes":"USDA PLANTS provides no duration for this record, so perennial hardiness applicability is unresolved.","source":"usda-plants-characteristics","sourceRecordId":"HYMA7","sourceTaxon":"Hydrangea macrophylla","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 88406, 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":"unresolved-applicability","assertions":[{"minimum":"6","interpretation":"ambiguous-single-value","precision":"whole-zone","zoneMapping":"source-stated","applicability":"uncertain","applicabilityNotes":"The recovered selector prints one Cold Hardiness Zone value but does not define it as a minimum threshold or a one-zone range.","source":"fps-eastern-us","sourceRecordId":"hydrangea-macrophylla","sourceTaxon":"Hydrangea macrophylla","taxonMatch":"exact","sourcePlacement":"Cold Hardiness Zone field in the recovered selector record","sourceVersion":"2016-wayback","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"},{"minimum":"5b","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":-13,"unit":"degrees-fahrenheit"},"applicability":"uncertain","applicabilityNotes":"USDA PLANTS provides no duration for this record, so perennial hardiness applicability is unresolved.","source":"usda-plants-characteristics","sourceRecordId":"HYMA7","sourceTaxon":"Hydrangea macrophylla","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 88406, 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":"mdfs-firewise-landscaping-plants","sourceName":"Firewise Landscaping Plants (Maryland, New Jersey, and West Virginia editions)","sourceUrl":"https://web.archive.org/web/20250408035155/https://dnr.maryland.gov/forests/documents/fire/firewise_plants.pdf","geography":{"grain":"state","stateCodes":["MD"]},"completeness":"partial","reviewStatus":"reviewed","scope":"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.","sourceVersion":"Maryland-Firewise-Plants-2015-01-08","asOf":"2015-01-08T00:00:00.000Z"},{"source":"mdfs-firewise-landscaping-plants","sourceName":"Firewise Landscaping Plants (Maryland, New Jersey, and West Virginia editions)","sourceUrl":"https://www.nj.gov/dep/parksandforests/fire/docs/Firewise_Landscaping_Plants_for_NJ.pdf","geography":{"grain":"state","stateCodes":["NJ"]},"completeness":"partial","reviewStatus":"reviewed","scope":"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.","sourceVersion":"New-Jersey-Firewise-Landscaping-Plants-archive-2025-09-01"},{"source":"mdfs-firewise-landscaping-plants","sourceName":"Firewise Landscaping Plants (Maryland, New Jersey, and West Virginia editions)","sourceUrl":"https://wvforestry.com/pdf/Firewise%20Landscaping%20Plants%20for%20WV.pdf","geography":{"grain":"state","stateCodes":["WV"]},"completeness":"partial","reviewStatus":"reviewed","scope":"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.","sourceVersion":"West-Virginia-DOF-Firewise-Landscaping-Plants-live-2026-08-26","asOf":"2026-08-26T00:00:00.000Z"},{"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":"ut-sp685","sourceName":"Landscaping Guidelines to Protect Your Home from Wildfire (SP685)","sourceUrl":"https://utia.tennessee.edu/publications/wp-content/uploads/sites/269/2023/10/SP685.pdf","geography":{"grain":"state","stateCodes":["TN"]},"completeness":"partial","reviewStatus":"reviewed","scope":"University of Tennessee Extension SP685 is Tennessee landscape guidance and publishes 78 represented plant owners. Most table rows are a carrier of Virginia Firescapes rather than an independent rating; Tennessee source scope does not change that lineage or establish site suitability.","sourceVersion":"UT-Extension-SP685-2006-10-24","asOf":"2006-10-24T00:00:00.000Z"},{"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"}],"firePerformanceConditions":[],"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."}