Heavily branched member of the legume family, known as highly invasive in northern Europe. First North American plants, the 0.7 acre group in the photo, found in 1998 near San Luis Obispo, California. Immediate eradication efforts began, with pulling and herbicides. Plant now under control.

 

Seeds could have spread downstream, causing wider outbreaks. In Europe, dense colonies outcompete native understory vegetation. Proves utility of an ounce of prevention: fast action staved off a major infestation.

More information