Prudent pruning is all in the timing

Clematis and rose.
Clematis and rose.
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Clematis pruning is near the top of my frequently asked questions list, the concern being when to do it.

The advice from professional nurseries is based on a list of groups that flower at the same time, but it could be simplified with a single statement for general guidance – those that flower in May and June, you should hardly ever prune; those that flower all summer through, prune them hard, that’s what you do. So most of the large flowering, mid-to-late summer types that bloom on new growth, are pruned quite severely in late winter. Clematis montana cultivars flower in June, so any necessary trimming comes when the display is over.