Rouge Cardinal Clematis

Clematis ‘Rouge Cardinal’

Rouge Cardinal Clematis is a bold, dramatic climber featuring rich, velvety crimson-red flowers that hold their colour beautifully in summer. The large, open blooms are accented by contrasting creamy stamens, making this variety a standout on trellises, fences, arbors, and pergolas.

Unlike many spring-blooming clematis, Rouge Cardinal flowers primarily on new growth, which makes it especially reliable in colder climates. Its dependable summer bloom time and strong colour make it a favourite for prairie gardens where late frosts can challenge early bloomers.

Plant Details

• Hardiness Zone: 3–8

• Mature Size: 8–10 ft tall

• Sun Exposure: Full sun to part sun (shade roots, sun on vines)

• Growth Rate: Moderate to fast

• Water Needs: Moderate

• Soil Preference: Well-drained, fertile soil

Why You’ll Love It

• Deep, saturated red blooms that don’t fade

• Blooms on new wood for reliable flowering

• Excellent choice for Zone 3 gardens

• Strong contrast against light-coloured structures

• Easy pruning compared to early-blooming clematis

Care Tips

• Plant the crown 2–3 inches below soil level for winter protection.

• Mulch well to keep roots cool and conserve moisture.

• Prune back hard in early spring (Group 3 clematis).

• Provide sturdy support and shelter from strong winds.

Photo from garden.org