{"id":"ceanothus-prostratus","license":"CC-BY-4.0","data":{"scientificName":"Ceanothus prostratus","commonNames":["Mahala mat"],"taxonRank":"species","acceptedName":"Ceanothus prostratus","family":"Rhamnaceae","ids":{"usdaSymbol":"CEPR","gbifKey":3039366,"itisTsn":28499,"wikidataQid":"Q5055735","inatTaxonId":76192},"usdaZoneMin":"4a","usdaZoneMax":"8b","zoneSource":"pnw590","states":["CA","ID","NV","OR","WA"],"rangeAssertions":[{"relation":"native","geography":{"grain":"state","stateCodes":["CA"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 76 — Southwestern U.S.A.","TDWG level 3 CAL — California"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"native","geography":{"grain":"state","stateCodes":["ID"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 73 — Northwestern U.S.A.","TDWG level 3 IDA — Idaho"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"native","geography":{"grain":"state","stateCodes":["NV"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 76 — Southwestern U.S.A.","TDWG level 3 NEV — Nevada"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"native","geography":{"grain":"state","stateCodes":["OR"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 73 — Northwestern U.S.A.","TDWG level 3 ORE — Oregon"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"},{"relation":"native","geography":{"grain":"state","stateCodes":["WA"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 73 — Northwestern U.S.A.","TDWG level 3 WAS — Washington"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z"}],"hardinessAssertions":[{"minimum":"5","maximum":"8","interpretation":"explicit-range","precision":"whole-zone","zoneMapping":"source-stated","applicability":"applicable","source":"osu-em-9103","sourceTaxon":"Ceanothus prostratus","taxonMatch":"exact","sourcePlacement":"Mahala Mat profile (PDF page 17)","sourceVersion":"EM 9103, February 2015","asOf":"2026-08-26T00:00:00.000Z"},{"minimum":"4","maximum":"8","interpretation":"explicit-range","precision":"whole-zone","zoneMapping":"source-stated","applicability":"applicable","source":"pnw-590","sourceRecordId":"groundcovers:Mahala mat","sourceTaxon":"Ceanothus prostratus","taxonMatch":"exact","sourcePlacement":"Mahala mat profile, USDA hardiness zones field","sourceVersion":"2023-10","asOf":"2026-08-26T00:00:00.000Z"},{"minimum":"4b","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":-23,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"CEPR","sourceTaxon":"Ceanothus prostratus","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 87149, Temperature, Minimum (°F)","sourceVersion":"PLANTS Help Document 2022; characteristics cache retrieved 2026-08-23","asOf":"2026-08-26T00:00:00.000Z"}],"plantForm":"groundcover","matureHeightFt":0.5,"waterNeed":"low","photo":{"file":"/images/plants/ceanothus-prostratus.jpg","sourceUrl":"https://www.inaturalist.org/photos/65508878","observationUrl":"https://www.inaturalist.org/observations/41301602","license":"cc0","attribution":"no rights reserved","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":"anaheim-2018","verdict":"recommend","verdictRaw":"listed fire-resistant","edition":"2018","url":"https://www.anaheim.net/DocumentCenter/View/26964/Fire-Resistive-Plant-Species","documentDate":"2018-02-06T00:00:00.000Z","accessedOn":"2026-08-23T00:00:00.000Z"},{"source":"firesmart-bc","verdict":"recommend","verdictRaw":"FireSmart-approved fire-resistant plant","claims":"Flagged by FireSmart BC as needing more research.","original":"pnw-590","url":"https://firesmartbc.ca/landscaping-hub/fire-resistant-plants/","accessedOn":"2026-08-23T00:00:00.000Z"},{"source":"nord-green-1977-psw124","verdict":"mixed","verdictRaw":"Fair performance","claims":"Prostrate ceanothus or squawcarpet is printed in Table 3's “Fair performance” section.","sourcePlacement":{"value":"Table 3: Fair performance","scheme":"nord-green-brushland-clearing-performance"},"edition":"PSW-124","url":"https://research.fs.usda.gov/download/treesearch/28938.pdf","documentDate":"1977-01-01T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"},{"source":"fitzgerald-waldo-2002-osu-frn6","verdict":"recommend","verdictRaw":"Fire-Resistant Plant Materials for Oregon","claims":"Ceanothus prostratus (Squaw carpet) is listed under “Groundcovers 18 inches and lower” for Central, Eastern, and Southern 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":"Central, Eastern, and Southern 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 groundcovers profile lists Ceanothus prostratus as Mahala Mat. The profile prints USDA Hardiness Zone: 5–8.","plantPart":"whole-plant","sourcePlacement":{"value":"Mahala Mat profile (PDF page 17)","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 groundcover plants for your fire-resistant landscape","claims":"The Mahala mat profile prints Ceanothus prostratus. The gallery points to PNW 590 for complete details.","plantPart":"whole-plant","sourcePlacement":{"value":"Mahala mat — Ceanothus prostratus","scheme":"osu-2023-groundcovers-gallery"},"edition":"November 2023 educational gallery","url":"https://extension.oregonstate.edu/gallery/fire-resistant-plant-profiles-groundcovers","documentDate":"2023-11-01T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"},{"source":"lubin-shelly-1997-ucfpl-compilation","verdict":"mixed","verdictRaw":"Conflicting information on fire performance.","claims":"1997 Landscape Vegetation Database row: Ceanothus prostratus (Mahala mat). Preserved UCFPL transcription marker: C5.","plantPart":"whole-plant","sourcePlacement":{"value":"Chapter 4, Landscape Vegetation Database","scheme":"ucfpl-1997"},"edition":"Internal Report 36.01.137 (July 1997)","url":"https://www.firesafemonterey.org/uploads/1/0/6/5/10653434/uc_forestproductslabdefensiblespaceplantlist_ocr.pdf","documentDate":"1997-07-01T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"},{"source":"radtke-1983-psw-gtr-067","verdict":"recommend","verdictRaw":"Generally high — Prostrate ceanothus","claims":"Table 5 rates this low-growing southern California landscape entry by fuel volume, inherent plant flammability, and ease of fire spread.","plantPart":"whole-plant","edition":"General Technical Report PSW-67","url":"https://research.fs.usda.gov/download/treesearch/28923.pdf","documentDate":"1983-09-01T00:00:00.000Z","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","NV","OR","WA"],"nativeStates":[],"rangeAssertions":[{"relation":"native","geography":{"grain":"state","stateCodes":["CA"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 76 — Southwestern U.S.A.","TDWG level 3 CAL — California"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"native","geography":{"grain":"state","stateCodes":["ID"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 73 — Northwestern U.S.A.","TDWG level 3 IDA — Idaho"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"native","geography":{"grain":"state","stateCodes":["NV"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 76 — Southwestern U.S.A.","TDWG level 3 NEV — Nevada"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"native","geography":{"grain":"state","stateCodes":["OR"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 73 — Northwestern U.S.A.","TDWG level 3 ORE — Oregon"]},"occurrenceStatus":"present","presenceStatus":"extant","source":"wcvp-v16","sourceVersion":"16","asOf":"2026-06-04T00:00:00.000Z","provenance":"cited"},{"relation":"native","geography":{"grain":"state","stateCodes":["WA"],"regions":["TDWG level 1 7 — NORTHERN AMERICA","TDWG level 2 73 — Northwestern U.S.A.","TDWG level 3 WAS — Washington"]},"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":["CA","ID","NV","OR","WA"]},"provenance":"legacy-field"}],"usdaZoneMin":"4a","usdaZoneMax":"8b","hardinessAssertions":[{"minimum":"5","maximum":"8","interpretation":"explicit-range","precision":"whole-zone","zoneMapping":"source-stated","applicability":"applicable","source":"osu-em-9103","sourceTaxon":"Ceanothus prostratus","taxonMatch":"exact","sourcePlacement":"Mahala Mat profile (PDF page 17)","sourceVersion":"EM 9103, February 2015","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"},{"minimum":"4","maximum":"8","interpretation":"explicit-range","precision":"whole-zone","zoneMapping":"source-stated","applicability":"applicable","source":"pnw-590","sourceRecordId":"groundcovers:Mahala mat","sourceTaxon":"Ceanothus prostratus","taxonMatch":"exact","sourcePlacement":"Mahala mat profile, USDA hardiness zones field","sourceVersion":"2023-10","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"},{"minimum":"4b","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":-23,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"CEPR","sourceTaxon":"Ceanothus prostratus","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 87149, 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":"5","maximum":"8","interpretation":"explicit-range","precision":"whole-zone","zoneMapping":"source-stated","applicability":"applicable","source":"osu-em-9103","sourceTaxon":"Ceanothus prostratus","taxonMatch":"exact","sourcePlacement":"Mahala Mat profile (PDF page 17)","sourceVersion":"EM 9103, February 2015","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"},{"minimum":"4","maximum":"8","interpretation":"explicit-range","precision":"whole-zone","zoneMapping":"source-stated","applicability":"applicable","source":"pnw-590","sourceRecordId":"groundcovers:Mahala mat","sourceTaxon":"Ceanothus prostratus","taxonMatch":"exact","sourcePlacement":"Mahala mat profile, USDA hardiness zones field","sourceVersion":"2023-10","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"},{"minimum":"4b","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":-23,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"CEPR","sourceTaxon":"Ceanothus prostratus","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 87149, 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":"lubin-shelly-1997-ucfpl-compilation","sourceName":"Defensible Space Landscaping in the Urban/Wildland Interface: A Compilation of Fire Performance Ratings of Residential Landscape Plants","sourceUrl":"https://www.firesafemonterey.org/uploads/1/0/6/5/10653434/uc_forestproductslabdefensiblespaceplantlist_ocr.pdf","geography":{"grain":"state","stateCodes":["CA"]},"completeness":"partial","reviewStatus":"reviewed","scope":"The UC Forest Products Laboratory says the guide covers properties of common California landscaping plants and was prepared for California fire agencies. FireApproved publishes 130 exact owners at historical California publication scope. The report is a 1997 compilation, not a current endorsement, site rating, or independent test of every row.","sourceVersion":"UCFPL-Internal-Report-36.01.137-1997-07","asOf":"1997-07-01T00:00:00.000Z"},{"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"},{"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"}],"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":"Ceanothus prostratus (Squaw carpet) is listed under “Groundcovers 18 inches and lower” for Central, Eastern, and Southern 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":4}]}],"maintenanceAssertions":[],"maintenanceConditions":null,"regulatoryReviews":{},"seedReviews":{}},"legacyCompatibilityProjection":{"nativeStates":["CA","ID","NV","OR","WA"],"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."}