Q. I am having a problem with my Knock Out roses that no one else has, and no one seems to know what it is. My roses are 8 or 9 years old and I have had the problem for the last three or four years.
Does Triple 13 fertilizer cause black spot disease in roses? My Knock Out roses were really nice before I fertilized. Now they are stricken heavily with the disease. — Lee Black spot symptoms are ...
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Is It Too Late to Cut Back Knockout Roses? What to Know Before Risking Next Year’s Blooms
Prune Knockout roses heavily in late winter or early spring as new growth begins. Lightly deadhead and shape in late summer, stopping two months before frost. For annual pruning, cut back one-third of ...
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