A few years back at our home on the Chesapeake Bay I replaced five KnockOut® rose bushes. For years they had been beautiful bushes, full of continuous color, and tall enough to provide a barrier between our patio and our neighbor’s. Best of all, this rose variety was supposed to be disease resistant and did not need spraying. I am not one for heavy garden maintenance, so it was wonderful to have inherited these easy-care varieties with our home purchase.

The problem was that a couple years earlier we noticed these bright, thick red shoots. Our landscaper suggested pruning ...

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