How to Train Clematis | Support & Pruning Method

Training clematis means guiding its stems onto a sturdy support at planting time and tying in new growth regularly, which shapes the vine and maximizes flowering.

Getting a clematis to cover a trellis, fence, or pillar comes down to installing support before planting, tying stems loosely and often, and pruning by group. Miss any step and you get a tangled, bare-bottomed plant flowering only at the top. The steps below give the full display clematis is known for.

Install the Support Before You Plant

A clematis climbs by wrapping leaf stems (petioles) around thin objects — it cannot grip a flat wall or thick post. The Royal Horticultural Society recommends putting support in at planting time to avoid disturbing roots later. What you use depends on location:

• Against a wall or fence: Fix horizontal wires about 5 cm (2 inches) off the surface for airflow. Space the first wire one-third up the eventual height, then add more above.
• On a freestanding trellis or pillar: Use chicken wire, netting, bamboo canes, or vertical wires. The RHS notes a freestanding clematis trellis product roundup showing which designs hold mature vine weight.

Place the crown 6 to 12 inches from the support. For wall plantings, set the plant 30 to 45 cm (12 to 18 inches) from the wall base so roots spread and catch rainfall. Bury the crown 3 to 4 inches below soil level — a reliable middle ground protecting from cold and encouraging strong shooting.

How to Attach and Spread Stems

Check ties and redirect stems every week during active growth. Use soft garden twine, cloth strips, or flexible clips — never bare wire or tight plastic ties, which cut into stems. Tie loosely so stems thicken without strangulation. Spread stems evenly over the support, fanning them apart rather than climbing in one clump. This gives each stem light and air (lowering mildew risk) and forces side shoots along the whole length, creating full flowering from bottom to top. Young plants benefit from a temporary training trellis in year one, letting roots build before moving to permanent support. For the first two springs, prune Group 2 and Group 3 clematis back to about 12 inches (or second set of leaf nodes) to build a sturdy low framework.

Tie Training to Your Pruning Group

Clematis are divided into three groups; training interacts with when and how hard you prune:

• Group 1 (spring bloomers): Prune right after flowering, removing dead or wayward stems. Redirect new growth onto support immediately after bloom ends.
• Group 2 (large-flowered, rebloomers): In early spring, cut one-third of stems back to strong buds. A second light prune after the first flush encourages more blooms.
• Group 3 (summer/fall bloomers): Prune hard in late winter/early spring to 12 inches or second set of leaf nodes. All flowering growth comes fresh off these short stubs; guide new growth outward evenly each season.

Regardless of group, prune out weak, dead, or damaged stems whenever seen — that energy goes into healthy shoots being trained.

Common Training Mistakes That Limit Blooms

Tying stems too tightly constricts them, killing growth above the tie. Installing support after planting disturbs roots when plants are most vulnerable. Leaving stems tangled and overlapped for weeks creates self-shaded leaves that flower poorly. A trellis or pillar not firmly anchored fails under a mature clematis’s weight, pulling it to the ground in a storm. Michigan State University’s extension bulletin notes clematis wilt and powdery mildew as common issues; training for airflow is health as well as aesthetics.