Roses go through two years of testing by the American Society of Roses. Knock Outs tested so well that they thought they were ...

Fact checked by Emily Peterson Reviewed by Julie Thompson-Adolf As one of the longest-blooming roses, the Knock Out rose ...

The spotted yellow leaves are the result of black spot disease. Knock Out roses, in general, are quite resistant (not immune) to black spot disease. During wet weather conditions, however, even ...

Related: The Easy-Care Petite Knock Out Rose Has Nonstop Red Blooms Prune Knock Out roses in spring just as the leaves begin to emerge on the canes. Check the plant for signs of growth when ...

They’re beautiful, symbolic and have been immortalized in poems and songs, but even seasoned gardeners can express ...