The jackmanii clematis produces red-flushed, purple flowers throughout summertime, into early autumn. This late-flowering, vinelike plant adds colour to your garden long after many traditional perennials wilt. Some clematis varieties utilise root or cuttings for propagation, but jackmanii clematises are more conveniently and effectively propagated with layering techniques.
Bend a healthy jackmanii clematis stem toward the ground. Jackmanii plants grow up to 10 feet tall, clinging to nearby trees or walls with spindly vines. Ideally, you should find a mature stem that is at least 6 feet tall.
Twist the vine halfway down, making sure the twisted part is able to reach the ground. You can expect some of the clematis plant's outer, bark-like casing to splinter and tear. This is good, because "wounding" the plant gives more surface area for the roots to emerge. Just make sure you do not rotate the stem so much that it completely tears off.
Apply a hormone rooting agent to the wounded stem if desired. Jackmanii clematis plants respond well to layering even without hormonal treatment, but a hormone rooting powder or gel further increases your chances of successful rooting.
Plant the wounded portion of the stem in the ground, making sure at least 1 foot of the plant is able to re-emerge from the ground after the twisted portion is buried. Plant in an area with partial shade.
Water the wounded stem, ensuring your soil is moist to the touch.
Dig around the wounded stem after three weeks. You should notice a root structure around the wound.
Cut the layered stem from the main plant. With an emerging root structure, the buried stem portion is ready for propagation.
Dig up the layered stem portion and replant it at a desired location in your garden. A new clematis plant with healthy leaves and flowers will emerge from the root structure within another two to three weeks.