How to Prune Clematis repens?
If required, cut back overlong shoots after flowering

Clematis repens · Clematis repens
Plant in a moisture-retentive, well-drained soil, with the roots and base of the plant kept cool and shaded by other plants or a layer of pebbles at the base. See clematis cultivation for further information. Its trailing stems make it ideal for growing through plants in the herbaceous border
If required, cut back overlong shoots after flowering