Clematis × jackmanii is a vigorous, deciduous climbing vine prized for its large, velvety flowers in rich purple to deep violet tones, often highlighted by contrasting creamy or greenish stamens. Blooming profusely from early to late summer, the flowers are typically star-shaped and borne on the current season’s growth, creating a dramatic vertical display when trained on trellises, arbors, fences, or pergolas. The foliage is medium green and provides an attractive backdrop to the intensely colored blooms.
- Size: Mature height: 8–12 ft (2.5–3.5 m). Spread: 3–6 ft (1–2 m). Growth habit: Fast-growing, twining climber
- Light: Full sun to partial shade; best flowering with at least 6 hours of sun
- Soil: Moist, well-drained soil rich in organic matter
- Water: Regular watering, especially during establishment; keep soil consistently moist but not waterlogged
- Roots: Keep roots cool and shaded with mulch or low groundcovers
- Pruning: Group 3 – prune hard in late winter or early spring to 12–18 in (30–45 cm) above ground