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Scotch broom

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
3-10 ft tall · 5 ft apart
Hardy in zones
5b-8b
very cold to frosty winters
Life cycle
Perennial
Bloom period
Spring
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...

Similar plants

Browse lateral options with similar roles, light needs, size, or native-range overlap; these are not filtered for a better climate fit.
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Kolkwitzia amabilis
Beauty bush
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Focal point
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Border
Pollinator
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Cape honeysuckle
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Focal point
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Pollinator
Border
Structure
Focal point
Container
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Border
Focal point
Pollinator
Structure
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Full sun / Part shade
Moderate water
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Structure
Pollinator
Focal point

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
5 ft
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. Use the source cards below to explore the references that informed this record.
Plotwright. (2026, May 17). Scotch broom (Cytisus scoparius). Retrieved 2026, October 9, from https://plotwright.com/plants/cytisus-scoparius
Sources used for this record
This record is compiled from the sources below.
RHS Find a Plant
Botanical research database
GBIF
Botanical research database
Wikipedia (ecoregion articles)
Botanical research database
USDA PLANTS Database
Government data source
Wikimedia Commons
Photo · CC BY-SA 4.0
Plants For A Future
Botanical research database