Since the Lancaster family and York Royal war of the roses ( 1455-1485 ), rose to become the symbol of England, England unified throughout the UK, United Kingdom, rose gradually became the British National flower. The wars of the roses, at that time on behalf of Lancaster Royal is a red rose, white rose on behalf of York Royal is. York royal power was Lancaster Royal defeated collapse, but the two sides in the war by marriage and reconciliation, so the two royal representative thereof, the two rose to be made one, a red rose white core. Then, the white Xinhong rose has become a symbol of England, has become a symbol of the United Kingdom