Uploaded May 2015 | Updated September 2026, 2 weeks ago

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How to Trim Knockout Rose Trees. Part of the series: Growing Roses. Knockout rose "trees" receive a special trimming method that gives them a certain resemblance to a tree as opposed to a shrub. See the right way to trim your Knockouts in this free video on growing roses. Read more: ehow.com/video_7625189_trim-knockout-rose-trees.html