{"schemaVersion":"0.2.0","identity":{"slug":"metrosideros-excelsa","canonicalPath":"/plants/metrosideros-excelsa","botanicalName":"Metrosideros excelsa","commonName":"New Zealand Christmas tree","type":"tree"},"coldHardiness":{"usdaZones":"9b-10b","plainLanguage":"frosty to mild winters","bandEdgesCelsius":{"coldFloor":-3.888888888888889,"warmCeiling":4.444444444444445},"rhsEquivalent":{"rating":"H3","summary":"half-hardy - mild winter or unheated greenhouse"}},"provenance":{"reviewStatus":"source-backed","citationCount":18,"citations":[{"field":"identity","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:598207-1","retrievedAt":"2026-05-17"},{"field":"summary","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:598207-1","retrievedAt":"2026-05-17"},{"field":"image","source":"wikimedia-commons","url":"https://commons.wikimedia.org/wiki/Special:FilePath/Metrosideros%20excelsa%20kz05.jpg?width=1200","retrievedAt":"2026-05-17"},{"field":"plant-type","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:598207-1","retrievedAt":"2026-05-17"},{"field":"light","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:598207-1","retrievedAt":"2026-05-17"},{"field":"moisture","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:598207-1","retrievedAt":"2026-05-17"},{"field":"hardiness","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:598207-1","retrievedAt":"2026-05-17"},{"field":"heat-zone","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:598207-1","retrievedAt":"2026-05-17"},{"field":"size","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:598207-1","retrievedAt":"2026-05-17"},{"field":"spacing","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:598207-1","retrievedAt":"2026-05-17"},{"field":"habit","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:598207-1","retrievedAt":"2026-05-17"},{"field":"design-roles","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:598207-1","retrievedAt":"2026-05-17"},{"field":"seasonal-interest","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:598207-1","retrievedAt":"2026-05-17"},{"field":"growth-stages","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:598207-1","retrievedAt":"2026-05-17"},{"field":"lifecycle","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:598207-1","retrievedAt":"2026-05-17"},{"field":"regional-guidance","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:598207-1","retrievedAt":"2026-05-17"},{"field":"success-tips","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:598207-1","retrievedAt":"2026-05-17"},{"field":"designer-notes","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:598207-1","retrievedAt":"2026-05-17"}],"sources":[{"label":"Plants of the World Online (Royal Botanic Gardens, Kew)","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:598207-1","license":"POWO content © Royal Botanic Gardens, Kew, CC BY 3.0; cite and link the specific taxon page."},{"label":"GBIF (Global Biodiversity Information Facility)","url":"https://www.gbif.org/species/3185393","license":"Aggregated taxonomic-backbone + occurrence data under open licenses; cite and link the GBIF species page."},{"label":"Wikipedia","url":"https://en.wikipedia.org/wiki/P%C5%8Dhutukawa","license":"Text under CC BY-SA 4.0; used as a corroborating encyclopedic reference (not a primary authority) - attribute + link the article."},{"label":"Trees and Shrubs Online (International Dendrology Society)","url":"https://www.treesandshrubsonline.org/articles/metrosideros/","license":"Trees and Shrubs Online content is CC BY-SA 4.0; cite the exact species account and author, link the source and licence, indicate changes, and retain compatible share-alike treatment for adapted material."},{"label":"RHS Find a Plant (Royal Horticultural Society)","url":"https://www.rhs.org.uk/plants/11097/metrosideros-excelsa/details","license":"RHS content © Royal Horticultural Society; paraphrased with attribution. Cited via the Find-a-Plant search landing (no public per-taxon API)."},{"label":"Wikimedia Commons file page","url":"https://commons.wikimedia.org/wiki/Special:FilePath/Metrosideros%20excelsa%20kz05.jpg?width=1200","license":"CC BY-SA 4.0; attribution required, share-alike for derivatives."},{"label":"Plants For A Future","url":"https://pfaf.org/user/Plant.aspx?LatinName=Metrosideros+excelsa","license":"Body text CC BY 4.0; cite and link the specific plant page."}]},"sourceability":{"whereToBuy":[],"localInventory":null},"gradingContract":{"fn":"gradePlantFit(usdaZones, placeDerivedZone) -> \"well-suited\" | \"marginal\" | \"wont-grow\" | null","fitGrades":["well-suited","marginal","wont-grow"],"placeInput":"DerivedZone: { zone; zoneDecimal; window; scenario; confidence; spreadHalfZones } - the consumer derives this for the target place.","windows":"now (2025) | mid-century (2055 anchor) | late-century (2085)","scenarios":"ssp126 | ssp370 (default) | ssp585"}}