Most conventional nurseries sell some in the Philadelphia, PA region, especially when in flower in late spring, with flowers being pea-like and usually yellow for the species with some cultivars showing a bronze-red, pink, white, or a bicolor of such. Flowers colors range from white ('San Francisco'), pale yellow ( 'Moonlight'), lilac-pink ('Lilac Time'), orange and apricot ('Pomona'), to red ('Stanford'). The weeping, arching stems of the Scotch Broom shrub are covered in delicate, fine leaves, which burst into a spectacular spring show of brilliant golden yellow. Scotch Broom is one of those shrubs, a barely woody one, that can become a rather ugly plant if not properly pruned. There are cultivars that are thought to be less aggressive than the species, but supporting data is minimal. scoparius should not be grown or sold in Oregon." It was at one time used as a landscape plant, but 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. Wild Cytisus Scoparius, or Common Broom or Scotch Broom, plant in. Cut back at least 1/3 of the older branches to the base of the plant and as. Thinning out the branches allows sun to reach the center of the bush. The key to pruning is to do it after seed dispersal. Caution: This species is often considered an invasive shrub-weed, it establishes in abandoned areas and is very competitive since it is a nitrogen fixer. A close up image of the bright yellow and red colors of the invasive scotch broom plant. Pruning is essential and unlike pruning for most shrubs, the Scotch Broom bush flowers in the spring and is pruned after flowering has occurred.Hardy to USDA Zone (5) 6 Native to central and southern Europe. Fruit a pod, 4-5 cm long, hairy along the margin, green, finally brown. 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. The stems and leaves have the ubiquitous broom-like look and feel that gives the plant its name. Leaves alternate, compound, 3-leaflets, each about 13 × 6 mm, obovate or lanceolate. Broadleaf deciduous shrub, 4-8 ft (1.2-2.4 m), dense, rounded mound, slender green branches.
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