How to Prune purple ground clematis?
Pruning (clematis) group 3. Cut back all the previous years stems to 15-20cm (6-8in) above soil level, before growth begins in spring

purple ground clematis · Clematis recta 'Purpurea'
Plant in a moisture-retentive, well-drained soil. Keep the base of the plant and roots cool and shaded by other plants or a layer of pebbles or flat stones at the base. Plant with the crown of the clematis at soil level. Mulch in late winter with garden compost or well-rotted manure, avoiding the immediate crown. Ideal for a border where it can be supported by other plants or useful groundcover. See clematis cultivation for more advice
Pruning (clematis) group 3. Cut back all the previous years stems to 15-20cm (6-8in) above soil level, before growth begins in spring