Archduke CharlesPrior to 1837 3 to 5 feet Thomas Rivers called 'Archduke Charles' "changeable as the chameleon". The full, very shapely flowers open with crimson outer petals and neat pink centers, then darken to solid crimson. The heat of the sun speeds the process: what appears to be a bi color hedge in spring and fall will be all red roses in mid summer. The neat, erect bush and constant bloom help make this one of our most popular varieties.