Knock Out® WhiteRose Knock Out White (RADwhite) Knock Out White is an extremely hardy and exceptionally disease resistant rose with a naturally compact, bushy, and upright growth habit. Knock Out White is a prolific bloomer, producing blooms continuously all the way from spring through to the end of autumn. Masses of cream buds open in small clusters, revealing clean white single to semi double flowers. This very easy to grow rose makes a lovely specimen in the