The Knock Out® Rose has revolutionized the concept of what a great garden rose should be: hardy, disease-free and floriferous. In hot, humid climates, The Knock Out Rose has earned a reputation for being the best garden performer. Knock Out roses bloom from early spring until the first hard frost. They require no special care to grow and provide many benefits, including: blackspot resistance, mildew tolerance, floriferousness and drought tolerance. This trouble free shrub suits any garden lifestyle.