When is the best time to cut roses back, and how much should be cut of
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usually late fall but if they are the Knockout variety, sometimes they needed to be trimmed twice a year.
They should be cut back in the fall. Cut each branch back to about 1 inch.
This site gives great advice: https://www.thespruce.com/prepare-your-roses-for-winter-1403574
1 inch from the bottom stalk.