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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 prune.

Mar 01, When to Prune. The beauty of Knock Out roses is that they can be pruned nearly any time without sacrificing beautiful blooms. Here in the south, we can expect the first flush of blooms around Mother’s Day in early May. This will be the largest flush of treecleanup.buzzted Reading Time: 4 mins.

A resting phase is a good time to prune. About the only time not to prune is late summer and early fall, as this might encourage late growth that wouldn't harden off in time for winter. In the North, winter is not a good time to prune, but winter is just fine in the treecleanup.buzzted Reading Time: 7 mins.

Oct 07, The main pruning period for knockout roses is in late winter or early spring, just as the plant prepares for another season of growth. You can still prune your roses even if new growth has already begun. Buds might start forming early if the winter was especially mild. In this case, snip the growth back to the first dormant bud%. Knock Out blooms continuously from April thru October if the faded blooms are removed regularly.

I visit mine every week and twist off the faded flower buds. Every four weeks I cut long stems back. This two-step process keeps new growth coming and removes the hormone-filled hips that tell the rose to bloom more slowly. Remember that your Knock Out will make flowers 16 inches above where you. Sep 17, 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. Knock Out roses typically triple in size after pruning.

Remove dead or damaged wood when you see it.

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Every two or three years, remove a third of old growth to rejuvenate the shrub. Oct 18, Examine the plant before pruning in mid-February. It may have fewer leaves so it is easier to see the number and thickness of the stems.

2. Remove dead and diseased canes.