Hydrangea arborescens, commonly known as smooth hydrangea, wild hydrangea, sevenbark, and sheep flower, is a species of flowering plant in the family Hydrangeaceae. Hydrangea is native to East North America and is widely known for its ability to treat kidney and bladder stones. The herb contains antibacterial properties and can assist in the healing of an enlarged prostate, prostatitis, and urinary tract infections.