Port (adulte) - Jerzy Opioła / Wikimedia Commons - CC BY-SA 4.0
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Forsythia intermédiaire
Forsythia × intermedia
Arbuste caducifolié cultivé presque exclusivement pour son explosion de fleurs jaunes à quatre lobes qui couvrent les rameaux arqués nus au début du printemps, avant l'apparition des feuilles. Hybride horticole de deux espèces asiatiques (Forsythia suspensa × F. viridissima) — non indigène d'Amérique du Nord. Le Missouri Botanical Garden le décrit comme une « vedette d'une saison » qui s'efface en arrière-plan après la floraison ; il gagne sa place comme signal de couleur en fin d'hiver plutôt que comme pivot décoratif sur quatre saisons.
Climate fit: narrow (38/100)
Focal point
Structure
Border
Light
Full sun / Part shade
Water
Moderate water
Mature size
72-120" tall · 96" apart
Hardy in zones
5a-8b
very cold to frosty winters
AHS heat range
1-9
Plant range authored in AHS heat-zone terms.
Native in Illinois
No
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Harvest and processing
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Le forsythia intermédiaire est un arbuste ornemental de paysage cultivé pour ses fleurs printanières, et non une plante alimentaire.
Cold hardiness
Future
These values are location-based: this location's current hardiness is the baseline, and the 2050 value is a projected future climate for this same location.
Now
Zone 6b
USDA
Published baseline for this location from 1991-2020.
Source: USDA Plant Hardiness Zone Map 2023 (1991-2020 climatology) via ArcGIS FeatureServer
Well-suited
2050
Zone 7a
Plotwright
Projected zone for this same location in 2050 (2041-2070) using SSP3-7.0 (regional rivalry).
Well-suited
In plain terms: This location is in Zone 6b today. Its hardiness profile is cold winters, and coldest nights are typically around -3°F. By 2050, the projected hardiness zone is Zone 7a based on SSP3-7.0 (regional rivalry). That is a +0.5-zone shift from Zone 6b to Zone 7a by 2050.
✓
Well-suited today and still thriving in 2050.
Heat tolerance
Future
Heat tolerance values are location-based too: heat days today are observed at this site, and the 2050 value projects this same location under a future climate.
Loading AHS heat-zone data for this location...
Where this plant fits
Suitable across 40 ecoregions — 34 climate-resilient through 2070 · 5 suited today · 1 newly possible by 2070. Best matches first.
Appalachian mixed mesophytic forests
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Appalachian-Blue Ridge forests
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Arizona Mountains forests
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Blue Mountains forests
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Canadian Aspen forests and parklands
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Central Pacific Northwest coastal forests
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Central Tallgrass prairie
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Central-Southern Cascades Forests
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Colorado Rockies forests
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Cross-Timbers savanna-woodland
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Sources & citations
Cite this page
For lesson plans, articles, or research that uses this page. To cite a single upstream fact instead, use its specific source listed below.
Plotwright. (2026, May 17). Forsythia intermédiaire (Forsythia × intermedia). Retrieved 2026, June 14, from https://plotwright.garden/plants/forsythia-intermedia
Sources for every fact
Every fact on this page traces to a source. 18 fields cited - 18 source-backed.
Missouri Botanical Garden PlantFinder
Botanical research database
Backs 17 fields
Identity
Summary
Plant type
Light
Moisture
Hardiness
Heat zone
Size
Spacing
Habit
Design roles
Seasonal interest
Growth stages
Lifecycle
Regional guidance
Success tips
Designer notes