{"schemaVersion":"0.2.0","identity":{"slug":"syagrus-romanzoffiana","canonicalPath":"/plants/syagrus-romanzoffiana","botanicalName":"Syagrus romanzoffiana","commonName":"Queen palm","type":"tree"},"coldHardiness":{"usdaZones":"9b-11b","plainLanguage":"frosty to nearly frost-free winters","bandEdgesCelsius":{"coldFloor":-3.888888888888889,"warmCeiling":10},"rhsEquivalent":{"rating":"H3","summary":"half-hardy - mild winter or unheated greenhouse"}},"provenance":{"reviewStatus":"source-backed","citationCount":18,"citations":[{"field":"identity","source":"usda-plants","url":"https://plants.usda.gov/plant-profile/SYRO4","retrievedAt":"2026-05-17"},{"field":"summary","source":"usda-plants","url":"https://plants.usda.gov/plant-profile/SYRO4","retrievedAt":"2026-05-17"},{"field":"image","source":"wikimedia-commons","url":"https://commons.wikimedia.org/wiki/Special:FilePath/Syagrusrommanzoffiana.JPG?width=1200","retrievedAt":"2026-05-17"},{"field":"plant-type","source":"usda-plants","url":"https://plants.usda.gov/plant-profile/SYRO4","retrievedAt":"2026-05-17"},{"field":"light","source":"usda-plants","url":"https://plants.usda.gov/plant-profile/SYRO4","retrievedAt":"2026-05-17"},{"field":"moisture","source":"usda-plants","url":"https://plants.usda.gov/plant-profile/SYRO4","retrievedAt":"2026-05-17"},{"field":"hardiness","source":"usda-plants","url":"https://plants.usda.gov/plant-profile/SYRO4","retrievedAt":"2026-05-17"},{"field":"heat-zone","source":"usda-plants","url":"https://plants.usda.gov/plant-profile/SYRO4","retrievedAt":"2026-05-17"},{"field":"size","source":"usda-plants","url":"https://plants.usda.gov/plant-profile/SYRO4","retrievedAt":"2026-05-17"},{"field":"spacing","source":"usda-plants","url":"https://plants.usda.gov/plant-profile/SYRO4","retrievedAt":"2026-05-17"},{"field":"habit","source":"usda-plants","url":"https://plants.usda.gov/plant-profile/SYRO4","retrievedAt":"2026-05-17"},{"field":"design-roles","source":"usda-plants","url":"https://plants.usda.gov/plant-profile/SYRO4","retrievedAt":"2026-05-17"},{"field":"seasonal-interest","source":"usda-plants","url":"https://plants.usda.gov/plant-profile/SYRO4","retrievedAt":"2026-05-17"},{"field":"growth-stages","source":"usda-plants","url":"https://plants.usda.gov/plant-profile/SYRO4","retrievedAt":"2026-05-17"},{"field":"lifecycle","source":"usda-plants","url":"https://plants.usda.gov/plant-profile/SYRO4","retrievedAt":"2026-05-17"},{"field":"regional-guidance","source":"usda-plants","url":"https://plants.usda.gov/plant-profile/SYRO4","retrievedAt":"2026-05-17"},{"field":"success-tips","source":"usda-plants","url":"https://plants.usda.gov/plant-profile/SYRO4","retrievedAt":"2026-05-17"},{"field":"designer-notes","source":"usda-plants","url":"https://plants.usda.gov/plant-profile/SYRO4","retrievedAt":"2026-05-17"}],"sources":[{"label":"USDA PLANTS Database","url":"https://plants.usda.gov/plant-profile/SYRO4","license":"U.S. federal government factual data (public domain); cite and link the species PROFILE page."},{"label":"Plants of the World Online (Royal Botanic Gardens, Kew)","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:246966-2","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/5293897","license":"Aggregated taxonomic-backbone + occurrence data under open licenses; cite and link the GBIF species page."},{"label":"Wikipedia","url":"https://en.wikipedia.org/wiki/Syagrus_romanzoffiana","license":"Text under CC BY-SA 4.0; used as a corroborating encyclopedic reference (not a primary authority) - attribute + link the article."},{"label":"RHS Find a Plant (Royal Horticultural Society)","url":"https://www.rhs.org.uk/plants/52430/syagrus-romanzoffiana/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/Syagrusrommanzoffiana.JPG?width=1200","license":"Public domain; no attribution required, credit retained as good practice."},{"label":"UF/IFAS Extension (EDIS ST609, Syagrus romanzoffiana: Queen Palm)","url":"https://edis.ifas.ufl.edu/publication/ST609","license":"Extension publication by the University of Florida IFAS; paraphrased with attribution. Cite and link the EDIS publication."},{"label":"Florida Invasive Species Council: 2026 List of Invasive Plant Species (Category I and II)","url":"https://www.floridainvasives.org/wp-content/uploads/2026/07/FISC-2026-Plant-List-Cat-I-II_April2026.pdf","license":"The council's published invasive plant list; its listing facts are paraphrased with attribution and a link. No source-catalog slug exists for it."},{"label":"Florida Natural Areas Inventory: Invasive species, Syagrus romanzoffiana","url":"https://www.fnai.org/species-communities/invasives/invasive-species?ID=156","license":"Invasive species profile from the Florida Natural Areas Inventory; paraphrased with attribution. No source-catalog slug exists for it; attribution is carried by the label and URL."},{"label":"Identifying Commonly Cultivated Palms (idtools.org): Syagrus romanzoffiana","url":"https://idtools.org/tools/1041/index.cfm?packageID=1109&entityID=3249","license":"Species fact sheet in the Identifying Commonly Cultivated Palms identification tool on idtools.org; paraphrased with attribution. No source-catalog slug exists for it; attribution is carried by the label and URL."},{"label":"UF/IFAS Extension Nassau County: Q: My Queen palm appears to be dead. Will it come back?","url":"https://blogs.ifas.ufl.edu/nassauco/2017/07/05/q-queen-palm-appears-dead-will-come-back/","license":"County extension blog post from the University of Florida IFAS; paraphrased with attribution. It is not an EDIS publication, so it is not registered under the uf-ifas-extension source."}]},"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"}}