How to prune clematis 'multi blue'

Late winter (February–March) for light tidy; after first flowering (June) for optional light trim. In late winter, cut out dead stems entirely and trim healthy stems back only to the highest pair of plump buds. Avoid cutting into the old wood framework. After first bloom, remove spent flower stems by one-quarter to one-third to encourage a second flush of blooms.

Annually (light tidy in late winter + optional post-first-flush trim). Yes, lightly — 'Multi Blue' is a Group 2 double/semi-double large-flowered clematis. It produces double flowers on old wood in spring and semi-double or single flowers on new wood in late summer. Prune cautiously in late winter: remove only dead and weak stems, then cut healthy stems back to the topmost strong bud pair to preserve old wood for the first flush.

In late winter, cut out dead stems entirely and trim healthy stems back only to the highest pair of plump buds. Avoid cutting into the old wood framework. After first bloom, remove spent flower stems by one-quarter to one-third to encourage a second flush of blooms.