{"schemaVersion":"0.2.0","identity":{"slug":"forsythia-intermedia","canonicalPath":"/plants/forsythia-intermedia","botanicalName":"Forsythia × intermedia","commonName":"Border forsythia","type":"shrub"},"coldHardiness":{"usdaZones":"5a-8b","plainLanguage":"very cold to frosty winters","bandEdgesCelsius":{"coldFloor":-28.88888888888889,"warmCeiling":-6.666666666666667},"rhsEquivalent":{"rating":"H7","summary":"very hardy"}},"provenance":{"reviewStatus":"source-backed","citationCount":18,"citations":[{"field":"identity","source":"missouri-botanical-garden-plantfinder","url":"https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=291997","retrievedAt":"2026-05-17"},{"field":"summary","source":"missouri-botanical-garden-plantfinder","url":"https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=291997","retrievedAt":"2026-05-17"},{"field":"image","source":"wikimedia-commons","url":"https://commons.wikimedia.org/wiki/Special:FilePath/Forsythia%20intermedia%20a1.jpg?width=1200","retrievedAt":"2026-05-17"},{"field":"plant-type","source":"missouri-botanical-garden-plantfinder","url":"https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=291997","retrievedAt":"2026-05-17"},{"field":"light","source":"missouri-botanical-garden-plantfinder","url":"https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=291997","retrievedAt":"2026-05-17"},{"field":"moisture","source":"missouri-botanical-garden-plantfinder","url":"https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=291997","retrievedAt":"2026-05-17"},{"field":"hardiness","source":"missouri-botanical-garden-plantfinder","url":"https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=291997","retrievedAt":"2026-05-17"},{"field":"heat-zone","source":"missouri-botanical-garden-plantfinder","url":"https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=291997","retrievedAt":"2026-05-17"},{"field":"size","source":"missouri-botanical-garden-plantfinder","url":"https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=291997","retrievedAt":"2026-05-17"},{"field":"spacing","source":"missouri-botanical-garden-plantfinder","url":"https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=291997","retrievedAt":"2026-05-17"},{"field":"habit","source":"missouri-botanical-garden-plantfinder","url":"https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=291997","retrievedAt":"2026-05-17"},{"field":"design-roles","source":"missouri-botanical-garden-plantfinder","url":"https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=291997","retrievedAt":"2026-05-17"},{"field":"seasonal-interest","source":"missouri-botanical-garden-plantfinder","url":"https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=291997","retrievedAt":"2026-05-17"},{"field":"growth-stages","source":"missouri-botanical-garden-plantfinder","url":"https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=291997","retrievedAt":"2026-05-17"},{"field":"lifecycle","source":"missouri-botanical-garden-plantfinder","url":"https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=291997","retrievedAt":"2026-05-17"},{"field":"regional-guidance","source":"missouri-botanical-garden-plantfinder","url":"https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=291997","retrievedAt":"2026-05-17"},{"field":"success-tips","source":"missouri-botanical-garden-plantfinder","url":"https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=291997","retrievedAt":"2026-05-17"},{"field":"designer-notes","source":"missouri-botanical-garden-plantfinder","url":"https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=291997","retrievedAt":"2026-05-17"}],"sources":[{"label":"Missouri Botanical Garden PlantFinder","url":"https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=291997","license":"Curated horticultural reference; cite and link the specific PlantFinder page."},{"label":"Wikimedia Commons file page","url":"https://commons.wikimedia.org/wiki/Special:FilePath/Forsythia%20intermedia%20a1.jpg?width=1200","license":"CC BY-SA 4.0; attribution required, share-alike for derivatives."}]},"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"},"heatTolerance":{"ahsHeatZones":"1-9"}}