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Any new growth they put out after this time may not harden off in time.



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 takedownshrub.pwon: 8 Federal Road, Suite 6 West Grove, PA United States. 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. Mar 01, Maintainence pruning can be done during the resting phase. It is also a good time to cut off withered blooms, but not necessary.

Heavy pruning though should be done in late February in warm, southern climates or in March for the moderate to cool climates. The only time I do not recommend pruning is in the fall. Aug 29, Knock Out roses have a tough, durable reputation and should rebound quickly from severe summer pruning.



For tips from our horticulture reviewer on deadheading your knockout roses, read on!



Cut them back to a foot or more below the Estimated Reading Time: 6 mins. During the growing season, ‘Knock Out' typically explodes in bloom for a few weeks, goes into a resting phase, and then explodes in bloom again. 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. Sep 21, Trim back tall or lanky stems of the rose any time of year with hand pruners. Wear gloves when working on the rose bush to prevent prickling by the stem thorns.

Cut off damaged, dead, or diseased stems and leaves anytime of year as needed, making the pruning cut 1/4 inch above a leaf or bud on stems that are alive or free of disease.





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