Border forsythia
Forsythia × intermedia
A deciduous shrub grown almost entirely for its explosion of yellow four-lobed flowers that line the bare arching stems in early spring, before the leaves emerge. A garden hybrid of two Asian species (Forsythia suspensa × F. viridissima) — not native to North America. Missouri Botanical Garden describes it as a "one-season wonder" that fades into the background after bloom, so it earns its place as a late-winter color signal rather than a four-season anchor.
Climate fit: moderate (43/100)
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 status
Cultivated — no wild native range
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Border forsythia is an ornamental landscape shrub grown for its early-spring flowers, not a food plant.
Cold hardiness
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
Plotwright
USDA Zone 6b
-5°F to 0°F
Well-suited
Zone 7a
Plotwright
0°F to 5°F
Well-suited
In plain terms: This location has cold winters. Its winters are projected to keep warming through 2050.
✓
Well-suited today and still thriving in 2050.
Heat tolerance
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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Similar plants
Browse lateral options with similar roles, light needs, size, or native-range overlap; these are not filtered for a better climate fit.
Yucca filamentosa
Adam's needle
A virtually stemless, broadleaf-evergreen native of central and eastern North America: a basal rosette of rigid, sword-shaped, spine-tipped leaves up to 30 inches long, fringed along the margins with the curly white threads that give the species its name. In early summer a flowering stalk shoots from the center to 5-8 feet, carrying nodding, bell-shaped, creamy-white flowers. Tough enough for poor sandy soil, heat, drought, and salt spray, it earns its keep as architectural structure in dry and seaside gardens.
Buxus sempervirens
Common boxwood
The classic broadleaf-evergreen shrub of formal hedges, topiary, and clipped borders — small, glossy dark-green opposite leaves on a dense rounded frame that takes shearing better than almost any other shrub. Native to southern Europe, western Asia, and northern Africa, it carries inconspicuous greenish-cream spring flowers and holds its leaves year-round. All parts are toxic if eaten and the foliage can cause skin irritation, but that same chemistry makes it reliably rabbit- and deer-resistant.
Pieris japonica
Japanese andromeda
A dense, upright-to-rounded broadleaf evergreen shrub, 8-10 feet tall and 6-8 feet wide, grown for year-round structure and its long late-winter-to-spring show of drooping panicles of fragrant, urn-shaped white (sometimes pink) flowers. Glossy dark green leaves are joined each spring by a striking flush of bronze-red to coppery new growth, and the chains of greenish-red flower buds form in fall and hold all winter for a second season of interest. Native to southeastern China, central to southern Japan, and Taiwan, it wants acidic, evenly moist but well-drained soil, shelter from harsh winter wind, and protection from hot afternoon sun in warmer zones. All parts are toxic if eaten.
Hydrangea quercifolia
Oakleaf hydrangea
A four-season native shrub of the southeastern United States, where NC State Extension notes it grows wild in moist woods and along stream banks. It is an upright, multi-stemmed deciduous shrub, slow-growing to roughly 4-8 feet tall and 4-10 feet wide, named for its large, oak-shaped, lobed dark-green leaves. Showy pyramidal 4-12 inch panicles of creamy-white flowers open from late spring into summer and fade to pink and then tan, while the bold foliage turns wine, orange, and mahogany in fall over peeling cinnamon bark. Easy and low-maintenance in organically rich, well-drained soil, it is grown as a specimen, in masses, or as an informal hedge.
Syringa vulgaris
Common lilac
An upright, multi-stemmed, suckering deciduous shrub in the olive family, grown for its intensely fragrant mid-to-late-spring (May) bloom of lilac-purple flowers in large conical panicles. Native to southeastern Europe and cultivated in North America since the early 1600s, it matures to 12-16 feet tall with blue-green, pointed-ovate to heart-shaped leaves. It needs cold winters and cool summers — and offers few ornamental features after bloom, with leggy form, no fall color, and summer powdery mildew.
Euonymus europaeus
European spindle
A deciduous European hedgerow shrub or small tree grown above all for one of the most arresting autumn shows of any native woody plant — rosy-pink, four-lobed fruit capsules that split to reveal vivid orange-coated seeds, hanging against red-purple foliage. Native across Europe and into western Asia (POWO, Kew), it is a tough, undemanding plant for hedgerows and informal screens that genuinely earns its keep for wildlife: insect-pollinated flowers in spring, seeds taken by birds, and aphid colonies that feed ladybirds and hoverflies. The honest pitch, and it is load-bearing: every part of this plant is toxic if eaten and the colourful fruit is especially so, so it must be sited away from where children might be tempted; it is also a primary winter host of the black bean aphid, so keep it well clear of a vegetable plot. With those two caveats respected, it is a dependable, wildlife-rich native — chosen for honest autumn drama, not for being trouble-free.
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). Border forsythia (Forsythia × intermedia). Retrieved 2026, June 24, from https://plotwright.com/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
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