Add easy-to-grow 'Knock Out' roses (Rosa 'Knock Out') to your garden for beautiful blooms all season. Fact checked by Emily Peterson Reviewed by Julie Thompson-Adolf As one of the longest-blooming ...

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 ...