Scotch broom
Cytisus scoparius
Scotch broom is a fast-growing, deciduous shrub native to western and central Europe — particularly abundant in Great Britain and Ireland — valued in the garden for its extravagant spring display of golden-yellow pea-flowers smothering every green stem. It tolerates poor, dry, acidic soils and thin sands where little else thrives, and fixes atmospheric nitrogen via root rhizobia, making it genuinely useful on impoverished ground. The honest catch is its behavior: all parts contain quinolizidine alkaloids (notably cytisine and sparteine) that are toxic to livestock and potentially harmful to humans, its explosive seed pods fling viable seed up to several metres, those seeds remain viable in soil for up to ten years, and in North America (Pacific Coast states) and Australasia it is a serious invasive weed listed on noxious-weed registers — so planting it in those regions is both ecologically harmful and in some jurisdictions illegal.
Climate fit: narrow (26/100)
Focal point
Border
Pollinator
Structure
Light
Full sun
Water
Low water
Mature size
36-120" tall · 60" apart
Hardy in zones
5b-8b
very cold to frosty winters
Native in Illinois
No
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Flowers are explosive — when a bee lands, the keel petals spring apart, dusting the visitor with pollen (a trip-mechanism).
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.
Kolkwitzia amabilis
Beauty bush
A large, vigorous, fountain-shaped deciduous shrub that earns its common name in late spring, when its arching stems are smothered in masses of pale-pink, yellow-throated, bell-shaped flowers. Native to China, it is one of the great old-fashioned spring shrubs — spectacular in full bloom, much loved by bees, and offering peeling brown bark for quiet winter interest. It is also genuinely big: expect 6 to 10 feet tall and wide at maturity, so give it room rather than fighting its size with the shears. The form to seek out is the Award-winning "Pink Cloud", which carries a clearer, richer pink than the variable seed-grown species.
Tecoma capensis
Cape honeysuckle
Cape honeysuckle (Tecoma capensis, syn. Tecomaria capensis; Bignoniaceae) is a vigorous, evergreen scrambling shrub native to southern and south-central Africa — from the Cape Provinces north through KwaZulu-Natal, Mozambique, Malawi, Tanzania, DR Congo, and Angola — valued for long, slender orange-to-apricot tubular flowers borne erratically across much of the year and attractive to nectar-feeding sunbirds. It reaches 2–3 m tall and wide as a free-standing mound, or considerably taller trained on a wall or trellis, and has received the RHS Award of Garden Merit. The honest catch is its frost-tenderness (barely survives to about 5°C; RHS H1C, roughly USDA 9b–11) combined with an invasive streak in mild climates: it suckers freely, self-layers, and has naturalised on the Azores and across coastal eastern Australia, so it must only be sited where its spread can be actively managed.
Tecomaria capensis
Cape honeysuckle
Cape honeysuckle (Tecomaria capensis, Bignoniaceae) is a vigorous, evergreen scrambling shrub from southern and south-central Africa, valued for tubular orange-to-apricot flowers borne erratically across much of the year. It reaches about 2-3 m tall and wide as a free-standing shrub, or can be trained much taller on a trellis or wall, and is widely used for informal hedging and as a hot-color border or container plant. It is frost-tender (RHS H1C; roughly USDA 9b-11) — in cooler climates it is grown under glass or as a summer container plant and overwintered indoors. In frost-free, mild climates it can become weedy: it has naturalised and is treated as invasive in parts of Australia and on islands such as the Azores, so site it where suckering and self-layering can be managed. It is not a recognised edible and is not flagged as notably toxic, though several plant parts feature in traditional southern-African medicine; treat it as ornamental rather than for consumption. Note the accepted binomial here is Tecomaria capensis (POWO/GBIF); the widely-seen Tecoma capensis is a synonym.
Viburnum plicatum
Doublefile viburnum
Doublefile viburnum is a deciduous shrub native to China, Korea, Japan, and Taiwan, grown for its spectacular tiered, horizontal branching draped in flat lacecap flower heads in late spring. It earns its place as a four-season focal point — white flowers in May, blue-black drupes in late summer, and often vivid red-purple autumn colour — but the honest catch is its sheer footprint: mature plants can spread 4–5 m wide with rigidly horizontal branches that resent hard pruning, and the fruit is not edible.
Ribes sanguineum
Flowering Currant
Flowering currant is a deciduous shrub native to the Pacific coast of western North America, from British Columbia south through Washington and Oregon to coastal California (as far south as Santa Barbara County), with a marginal inland presence in Idaho and a southern outpost on Guadalupe Island, Mexico. Its bold dangling racemes of deep-pink to crimson flowers open in early spring, often before the leaves, making it one of the most conspicuous late-winter shrubs in mild gardens. The honest catch is threefold: it is a confirmed alternate host of white pine blister rust (a serious pathogen of five-needled pines), its blue-black berries are edible but notably insipid, and it has become an established invasive weed in New Zealand (where it forms dense stands excluding native species) and is a more minor, localized weed in Tasmania.
Viburnum opulus
Guelder rose
A large deciduous European-native shrub grown for a three-season show: maple-like lobed leaves that color well in autumn, flat white lacecap flower clusters in late spring, and heavy drooping bunches of translucent red berries that hang on into winter. Each flower head is a showy ring of large sterile outer florets surrounding a fertile center, giving the lacecap its distinctive look. It is one of the best all-round wildlife shrubs you can plant — the open flowers feed hoverflies and bees, and the red fruit feeds birds through the cold months — and it tolerates wet soil, making it a natural choice for hedgerows, damp corners, and wild gardens. Two honest cautions go with it: the raw berries are mildly toxic to people, and this is the European guelder rose, not the North American cranberrybush.
Educator packet
Plant packet
Scotch broom educator packet
Scotch broom is a fast-growing, deciduous shrub native to western and central Europe — particularly abundant in Great Britain and Ireland — valued in the garden for its extravagant spring display of golden-yellow pea-flowers smothering every green stem. It tolerates poor, dry, acidic soils and thin sands where little else thrives, and fixes atmospheric nitrogen via root rhizobia, making it genuinely useful on impoverished ground. The honest catch is its behavior: all parts contain quinolizidine alkaloids (notably cytisine and sparteine) that are toxic to livestock and potentially harmful to humans, its explosive seed pods fling viable seed up to several metres, those seeds remain viable in soil for up to ten years, and in North America (Pacific Coast states) and Australasia it is a serious invasive weed listed on noxious-weed registers — so planting it in those regions is both ecologically harmful and in some jurisdictions illegal.
Scientific name
Cytisus scoparius
Plant type
shrub
Hardiness
5b-8b
Light
full-sun
Moisture
low
Spacing
60 inches
Classroom prompts
- Which plant traits are observations, and which are care recommendations?
- How would this plant fit change if the garden location moved warmer, colder, wetter, or drier?
- Which source-backed facts would you cite in a lesson handout?
Use the Sources & citations section below for page citation styles and the field-level source list.
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). Scotch broom (Cytisus scoparius). Retrieved 2026, June 30, from https://plotwright.com/plants/cytisus-scoparius
Sources for every fact
Every fact on this page traces to a source. 18 fields cited - 18 source-backed.
RHS Find a Plant
Botanical research database
Backs 17 fields
Identity
Summary
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Size
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Seasonal interest
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