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Leggy knockout roses

My knockout roses (4 of them) are three years old are not bushy, I cut them back but they just return tall and leggy. I have another one that is just a full and beautiful bush, what is wrong and is there anything I can do? Thanks
Submitted by BHGPhotoContest

If the plants regularly become tall and leggy, it may be an indication that they are not getting enough sun. Roses grow best with full sun.

Answered by DSchrock

Knock Out roses really do not need standard rose pruning. To promote healthy growth and encourage lots of flowers, in late winter (or, now), simply use hedge trimmers or loppers to shear the shrub down to about 1/3 or 1/2 its current height. It is okay if what remains is only about 12 to 18 inches above the ground. This should help. If you are using pruners, try to cut back to an outward-facing dormant bud, because a branch will emerge where that leads away from the center of the plant.

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I have heard that if you are using Miracle grow or other variety that this can happen. The plant shoots up before it has a chance to get sturdy. Only rose foods and proper amounts for roses would be good. Just a suggestion. :)
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