Rouge Cardinal Clematis is a multi-stemmed deciduous woody vine with a twining and trailing habit of growth. The Clematis … Rouge Cardinal’ has brilliant 5-6″ velvety flowers of deep crimson. Bred clematis hybrid Rouge Cardinal … This vine grows best in a fertile, well-drained, alkaline soil. Its average texture blends into the landscape, but can be balanced by one or two finer or … Its average texture blends into the landscape, but can be balanced by one or two finer or … Botanical Name: Clematis 'Rouge Cardinal' Form: Vine Sun Exposure: Full Sun, Partial Shade Height/Habit: 6 - 10 feet Spread: 36 - 48 inches Spacing: 4 - 6 feet Hardiness Zone: 4-8 Flowering Date: Blooms from early summer to early fall Planting Instructions: GREEN group vining clematis … Clematis is a favorite flower of landscape designers. A choice site is key to the success of establishing this perennial; roots should be kept cool and moist. A popular plant among amateur gardeners. Among the demanded varieties, clematis stands out for its magnificent forms of large-flowered privateer Rouge Cardinal, a description of which we will now consider. This is a free-flowering variety of Clematis. Rouge Cardinal Clematis is a multi-stemmed deciduous woody vine with a twining and trailing habit of growth.