The growth habit is erect, and the blooms repeat reliably. The foliage is small, dark green and glossy. Archduke Charles' starts blooming in April in the Texas Hill Country and blooms almost continuously until frost. The petals curl and may therefore appear pointed. As they age they turn darker shades and finally are a rich crimson.
Flower colors range from palest pink to crimson on the same plant.
Archduke Charles' has good fragrance. Archduke Charles' can be temperamental in cold climates, but it is quite hardy. Generally it does better in warm climates. Availability is limited 'Archduke Charles' makes a wonderful low hedge or foundation planting. This statement was prompted by the fact that the petals change color as the blooms age.