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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. Follow these simple steps to cut back your Knock Out Roses:Location: 8 Federal Road, Suite 6 West Grove, PA United States.
Mar 01, 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 blooms. Then the plant will enter a resting phase and then burst with repeat blooms every few bushdigging.clubted Reading Time: 4 mins. Mar 26, 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 bushdigging.club: Steve Bender. May 18, 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.
Jan 08, Knockout roses are very fast-growing, and you have to prune them timely. A proper pruning technique is a must. February is the best month for pruning. First, remove the deadheads and any broken branches. Open up the inside of the bush by removing dead or unproductive branches. Jul 05, 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 Views: K. 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. Every two or three years, remove a third of old growth to rejuvenate the shrub.
Dec 15, While you can put away the fungicide and the fertilizer, pruning is a chore you still need to do in late winter or early spring each year. Once your Knock Out has reached its mature size of 3 to 4.