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Start fertilizing with a quality, slow release rose fertilizer in April or.

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. 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 shrubcleanup.buzzted Reading Time: 4 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 Estimated Reading Time: 5 mins. Jan 08, You can prune once a year and then trim and cut when you feel the need Proper Pruning Knockout roses are such hardy plants that any way you prune, they survive and thrive!Estimated Reading Time: 4 mins. ‘Knock Out' (red, pink, double, etc.) blooms on new growth. This means that you can prune it almost anytime you want without ruining the season's bloom.

If you prune now, you'll remove some flower buds and delay flowering, but you'll get lots of blooms in a couple of weeks.