knockout roses

"Is it necessary to deadhead 'Knockout' roses and do I need to fertilize them?"
Submitted by BHGPhotoContest

All roses bloom best with some fertilizer. Apply rose food in the spring when the plant's new growth begins. Make additional applications through the growing season as directed by the label on the fertilizer package. 'Knockout' roses are "self-cleaning", which means the flowers will drop off on their own after blooming, no deadheading needed.

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How late in the year can knockout roses be ferilized?
Submitted by iohjjh