{"schemaVersion":"0.2.0","identity":{"slug":"achillea-ptarmica","canonicalPath":"/plants/achillea-ptarmica","botanicalName":"Achillea ptarmica","commonName":"Sneezewort","type":"perennial"},"coldHardiness":{"usdaZones":"3a-9b","plainLanguage":"brutally cold to frosty winters","bandEdgesCelsius":{"coldFloor":-40,"warmCeiling":-1.1111111111111112},"rhsEquivalent":{"rating":"H7","summary":"very hardy"}},"provenance":{"reviewStatus":"source-backed","citationCount":18,"citations":[{"field":"identity","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:2336-2","retrievedAt":"2026-05-17"},{"field":"summary","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:2336-2","retrievedAt":"2026-05-17"},{"field":"image","source":"wikimedia-commons","url":"https://commons.wikimedia.org/wiki/Special:FilePath/Sneezewort%20(Achillea%20ptarmica)%20-%20Oslo,%20Norway%202020-08-14.jpg?width=1200","retrievedAt":"2026-05-17"},{"field":"plant-type","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:2336-2","retrievedAt":"2026-05-17"},{"field":"light","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:2336-2","retrievedAt":"2026-05-17"},{"field":"moisture","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:2336-2","retrievedAt":"2026-05-17"},{"field":"hardiness","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:2336-2","retrievedAt":"2026-05-17"},{"field":"heat-zone","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:2336-2","retrievedAt":"2026-05-17"},{"field":"size","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:2336-2","retrievedAt":"2026-05-17"},{"field":"spacing","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:2336-2","retrievedAt":"2026-05-17"},{"field":"habit","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:2336-2","retrievedAt":"2026-05-17"},{"field":"design-roles","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:2336-2","retrievedAt":"2026-05-17"},{"field":"seasonal-interest","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:2336-2","retrievedAt":"2026-05-17"},{"field":"growth-stages","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:2336-2","retrievedAt":"2026-05-17"},{"field":"lifecycle","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:2336-2","retrievedAt":"2026-05-17"},{"field":"regional-guidance","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:2336-2","retrievedAt":"2026-05-17"},{"field":"success-tips","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:2336-2","retrievedAt":"2026-05-17"},{"field":"designer-notes","source":"powo","url":"https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:2336-2","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:2336-2","license":"POWO content © Royal Botanic Gardens, Kew, CC BY 3.0; cite and link the specific taxon page."},{"label":"RHS Find a Plant (Royal Horticultural Society)","url":"https://www.rhs.org.uk/plants/search-results?query=Achillea%20ptarmica","license":"RHS content © Royal Horticultural Society; paraphrased with attribution. Cited via the Find-a-Plant search landing (no public per-taxon API)."},{"label":"GBIF (Global Biodiversity Information Facility)","url":"https://www.gbif.org/species/3120333","license":"Aggregated taxonomic-backbone + occurrence data under open licenses; cite and link the GBIF species page."},{"label":"Wikipedia","url":"https://en.wikipedia.org/wiki/Achillea_ptarmica","license":"Text under CC BY-SA 4.0; used as a corroborating encyclopedic reference (not a primary authority) — attribute + link the article."},{"label":"Wikimedia Commons file page","url":"https://commons.wikimedia.org/wiki/Special:FilePath/Sneezewort%20(Achillea%20ptarmica)%20-%20Oslo,%20Norway%202020-08-14.jpg?width=1200","license":"Photo by Ryan Hodnett, licensed under CC BY-SA 4.0 via Wikimedia Commons."}]},"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"}}