How far back should knockout roses be trimmed?
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Where do you live?
Always cut a bloom back to the five leaf sprout on stem. Always cut stalk above where it "Y"s out.
12 to 18 inches will be fine.
Every year I trim my Knockout rose to 18" to 24". It comes back beautiful and grows quickly. We live in coastal Virginia.
Well first of all I do not cut my roses back unless they are getting too tall. The energy for new roses are stored in the cane. Cutting 1/3 of the canes back every few years will make new canes shoot up.
That saidThis is what my book says:
Prune in late winter or early spring, while the plant is still dormant. Remove any dead or damaged wood, do a little shaping if necessary, and take out some of the interior stems to improve air circulation. Every 2 or 3 years remove about one third of the old branches to stimulate new, fresh growth. If you are trying to keep the roses at a certain height, you can cut them back hard with hedge shears. No need to worry about usual rose pruning rule of cutting back to an outward facing leaf bud – just lop them down to the desired size