Winter pruning: In the Willamette Valley, prune from mid-February to.

Whether you’re pruning roses to reduce the size, deadheading spent blooms, pruning to shape the shrub, or pruning for airflow, you’ll always cut the same way.

Using sharp hand pruners, loppers, or a pruning saw (for large branches), cut the branch at back to an outward-facing stumphaul.barted Reading Time: 5 mins. Sep 17, The general rules for pruning Knock Out roses include: Always prune in early spring when new shoots are beginning to form on the canes.

Prune to about a third of the desired final size.

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Knock Out roses typically triple in size after pruning. Remove dead or damaged wood when you see it. Estimated Reading Time: 5 mins. Roses should be pruned to encourage new growth and a succession of flowers throughout the growing season. Roses are pruned annually to encourage healthy plants.

If pruned improperly, plants will have weak canes, poor form and little air circulation. Underpruning is the most common cause of an unproductive stumphaul.barted Reading Time: 5 mins. Use clean, sharp tools.

Start at the bottom of the bush and work up. Prune less in the beginning. You can always go back and cut away more Prune dead wood back to living plant tissue with an anvil pruner.

Pruning the lateral canes can also encourage blooming.

Knock Out Roses Pruning Steps: To maintain a size of 3–4’ w x 3–4’ h, Knock Out Roses should be cut back once a year to 12” high.

Check your rose bush from time to time in late winter/early spring, and when you start to see new shoots growing from the canes on your rose bush, that’s a good sign that it’s time to stumphaul.baron: 8 Federal Road, Suite 6 West Grove, PA United States.