This woody shrub is superficially attractive, but is an alien in California, and causes considerable damage to ecosystems by displacing native plants, which can support more native wildlife. Moreover, the advance of such aliens actually endanger the survival of some native flora.
This alien species is highly invasive and disruptive to many ecoregions, including this mixed oak woodland.
They were growing out of a dry rock creek that leads to the ocean.
Cytisus scoparius, the common broom or Scotch broom, syn. Sarothamnus scoparius, is a perennial leguminous shrub native to western and central Europe. In Britain and Ireland, the standard name is broom, but this name is also used generically for other related species (see broom), and the term common broom is sometimes used for clarification. In other English-speaking countries, the most prevalent common name is Scotch broom (or Scot's broom); English broom is also occasionally used.