Common broom, introduced into New Zealand as an ornamental plant, has become naturalised throughout the country and is doing well in similar conditions to its homeland. Being an invasive weed it has become a problem species due to its aggressive seed dispersal and proven very difficult to eradicate and costly to control.
Common broom (Cytisus scoparius) is a native of northwestern Europe, where it is found in sunny sites. In spring and summer the shrubs are covered in profuse golden-yellow flowers. In late summer, its peapod-like seed capsules burst open, often with an audible pop, spreading seed from the parent plant.