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.
Hi, I'm Stan DeFreitas, Mr. Green Thumb for askmrgreenthumb.com. We talk about the standard tree rose Knock Out or the Knock Out Rose Tree. Remember, basically, it's a shrub that's been trimmed up a little bit to look a little more like a small tree. Sometimes they're called standards, but when you do them, you're not going to do much different then you do with a regular bush. You're going to trim it, of course, to keep the base clean, but you're also going to trim the top like you always do, and you can see we're going to trim some of the top pieces just to kind of keep it within bounds. Remember that the Knock Out Tree Rose is still one that's going to be a very tight bush, or a very tight tree, if you will. In other words, we're not going to trim it back much more than about one-third. We're going to make a nice, clean cut, and we're going to trim back to another logical spot on the stem. In other words, back to a branch, and you can see we're going to make a nice, clean cut here, and we're taking off this tip of the branch, about one-third of the bush at any one given time. Keeping your tree roses is pretty much like keeping your bush roses, only we're keeping it a little bit more of a tree or standard form. That means we're trimming it up, but we're keeping the ball if you will on the top of the plant. For askmrgreenthumb.com, I'm Stan DeFreitas.