Reportedly the world's largest single rose bush lives in Tombstone, Arizona at the Rose Tree Museum, 4th and Toughnut. Commonly called the Lady Banks, the "lady banksiae" a white rose, came from Scotland in 1885. It covers over 8000 square feet. It blooms in the early spring and is thornless. For a fee you can view it, picnic, or get married. You can also buy a rooted stalk and take home some history. The original rootstalk was reportedly brought in from Scotland. Shown here is a yellow rose, my home, not necessarily under control.