Clematis Princess Kate is as beautiful as Princess Kate herself! She has beautiful, large, tulip-shaped flowers that are facing upward. The flowers are white on the inside and purple-red on the outside. The flowers are sterile so there is no seed production. This climber is hardy to USDA Zone 5a and demands little maintenance. You can enjoy the abundant flowering of Princess Kate in mid-summer. Plant Princess Kate in fertile, moist yet well-drained soil in the sun or semi-shade.