Cytisus scoparius (Cytisus scopiaris? ) Fabaceae
Scotch Broom, Common Broom SI-ti-sus sko-PAH-ree-us
- Broadleaf deciduous shrub, 4-8 ft (1.2-2.4 m), dense, rounded mound, slender green branches.
Leaves alternate, compound, 3-leaflets, each about 13 × 6 mm, obovate or lanceolate. Flowers
sweet-pea shaped, bright yellow, about 2.5 cm long, solitary or in pairs, can cover the plant in spring and
early summer, very noticeable. Fruit a pod, 4-5 cm long, hairy along the margin, green, finally
- Sun. Drought resistant.
- Hardy to USDA Zone (5) 6 Native to central and southern Europe.
- Caution: This species is often considered an invasive shrub-weed, it establishes in
"waste areas" and is very competitive since it is a nitrogen fixer.
In February 2010, the Oregon Department of Agriculture amended its noxious weed quarantine (OAR 603-52-1200) to
include Cytisus scoparius and the rule "prohibits the growing or sale of Scotch broom in Oregon
regardless of the variety or cultivar. C. scoparius should not be grown or sold in Oregon."
- There are cultivars that are thought to be less aggressive than the species, but supporting data is minimal.
Flowers colors range from white ('San Francisco'), pale yellow ('Moonlight'), lilac-pink ('Lilac Time'), orange and
apricot ('Pomona'), to red ('Stanford').
- Oregon State Univ. campus: southwest Reser Stadium (probably a cultivar).