{"id":"poa-secunda-var-ampla","license":"CC-BY-4.0","data":{"scientificName":"Poa ampla","commonNames":["Big bluegrass"],"taxonRank":"variety","acceptedName":"Poa secunda var. ampla","family":"Poaceae","ids":{"usdaSymbol":"POSE","gbifKey":9913820},"usdaZoneMin":"3b","zoneSource":"usda-plants","states":["AK","AZ","CA","CO","ID","ME","MI","MN","MT","ND","NE","NM","NV","OK","OR","SD","UT","WA","WY"],"hardinessAssertions":[{"minimum":"3b","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":-33,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"POSE","sourceTaxon":"Poa ampla","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 25064, Temperature, Minimum (°F)","sourceVersion":"PLANTS Help Document 2022; characteristics cache retrieved 2026-08-23","asOf":"2026-08-26T00:00:00.000Z"}],"plantForm":"grass","matureHeightFt":1.3,"waterNeed":"low","evidence":[{"source":"unr-fs-97-36-greenstrips","verdict":"recommend","verdictRaw":"Common perennial plants used in greenstrips and selected characteristics important to their establishment and use","claims":"Table 1 row: Big bluegrass (Poa ampla). Minimum yearly precipitation: 10-12 inches; salt or alkali tolerance: Low; status: N; growth form, flower color, or season: Bunch; varieties: ‘Sherman’. The fact sheet says greenstrips should be grazed or mown frequently enough to reduce fuel buildup; otherwise their effectiveness is reduced dramatically. The exact GBIF match for source name Poa ampla is accepted Poa secunda var. ampla (key 9913820).","sourcePlacement":{"value":"common perennial plant used in a maintained northern Nevada greenstrip","scheme":"unr-fs-97-36-greenstrip"},"edition":"Fact Sheet 97-36","url":"https://naes.agnt.unr.edu/PMS/Pubs/2020-3342.pdf","documentDate":"1997-01-01T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"},{"source":"nord-green-1977-psw124","verdict":"recommend","verdictRaw":"Grass species recommended for fuelbreak sites in California","claims":"Sherman big bluegrass is printed in Table 2's California fuelbreak recommendation.","sourcePlacement":{"value":"Table 2: Grass species recommended for fuelbreak sites in California","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":"nv-forestry-tahoe-landscaping-guide","verdict":"recommend","verdictRaw":"low — Bluegrass, big — Poa ampla [Ecotype of P. secunda ssp. juncifolia]","claims":"Table 1's Fire Hazard column prints “low” for this taxon. The guide calls the rating a rough estimate of potential flammability, not a result of scientific trials. Its footnote says plants that turn brown often become high fire hazards and tells readers to mow grasses and forbs when they begin to turn brown.","plantPart":"whole-plant","sourcePlacement":{"value":"Fire Hazard column: low","scheme":"tahoe-guide-2006"},"edition":"Bulletin 06-01 (2006)","url":"https://forestry.nv.gov/uploads/missions/20210304_AMT_2006_Home_Landscaping_Guide_Lake_Tahoe.pdf","documentDate":"2006-01-01T00:00:00.000Z","accessedOn":"2026-08-25T00:00:00.000Z"}],"flammabilityClass":"fire-resistant","ratingReason":"consensus","recommendation":"on-list","author":"grayson-graham","reviewStatus":"draft","lastVerified":"2026-08-25T00:00:00.000Z","reviewNotes":"The exact GBIF match for source name Poa ampla is accepted Poa secunda var. ampla (key 9913820)."},"localAssessmentInputs":{"stateDistribution":["AK","AZ","CA","CO","ID","ME","MI","MN","MT","ND","NE","NM","NV","OK","OR","SD","UT","WA","WY"],"nativeStates":[],"rangeAssertions":[{"relation":"documented-occurrence","geography":{"grain":"state","stateCodes":["AK","AZ","CA","CO","ID","ME","MI","MN","MT","ND","NE","NM","NV","OK","OR","SD","UT","WA","WY"]},"provenance":"legacy-field"}],"usdaZoneMin":"3b","usdaZoneMax":null,"hardinessAssertions":[{"minimum":"3b","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":-33,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"POSE","sourceTaxon":"Poa ampla","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 25064, 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":"selected","assertion":{"minimum":"3b","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":-33,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"POSE","sourceTaxon":"Poa ampla","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 25064, Temperature, Minimum (°F)","sourceVersion":"PLANTS Help Document 2022; characteristics cache retrieved 2026-08-23","asOf":"2026-08-26T00:00:00.000Z","provenance":"cited"},"assertions":[{"minimum":"3b","interpretation":"minimum-threshold","precision":"half-zone","zoneMapping":"derived-containing-band","sourceMeasurement":{"kind":"minimum-temperature","value":-33,"unit":"degrees-fahrenheit"},"applicability":"applicable","source":"usda-plants-characteristics","sourceRecordId":"POSE","sourceTaxon":"Poa ampla","taxonMatch":"source-identifier","sourcePlacement":"PlantCharacteristics record 25064, 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":"nv-forestry-tahoe-landscaping-guide","sourceName":"Home Landscaping Guide for Lake Tahoe and Vicinity (Ed. Bulletin 06-01)","sourceUrl":"https://forestry.nv.gov/uploads/missions/20210304_AMT_2006_Home_Landscaping_Guide_Lake_Tahoe.pdf","geography":{"grain":"aggregate-region","stateCodes":["CA","NV"],"regions":["Lake Tahoe Basin"]},"completeness":"partial","reviewStatus":"reviewed","scope":"Nevada Division of Forestry and University of Nevada Cooperative Extension publish Bulletin 06-01 for the Lake Tahoe Basin and vicinity. FireApproved publishes 83 exact rated owners as basin context across Nevada and California. Rough estimates are not statewide or site ratings.","sourceVersion":"Nevada-Extension-Bulletin-06-01-2006","asOf":"2006-01-01T00:00:00.000Z"}],"firePerformanceConditions":[],"maintenanceAssertions":[],"maintenanceConditions":null,"regulatoryReviews":{},"seedReviews":{}},"legacyCompatibilityProjection":{"nativeStates":[],"invasiveIn":[],"usdaZoneMin":"3b"},"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."}