Some clematis flowers unfurl to reveal more than one color on each flower petal. Clair de Lune (Clematis ‘EVIrin’) opens white blooms with pale, lilac-tinted shadings along wavy petal edges. Dark purple flower anthers give each blossom a contrasting center. This pretty vine, previously known as ‘Blue Moon,’ is a gold winner of the Chelsea Flower Show in England for its striking 7-inch-wide flowers. Blooms show the best color when grown in part shade. Vines grow 8 to 10 feet tall by 3 feet wide. Hardy in Zones 4 to 9.