Knock Out RoseDepartment The Knock Out Family of Roses are easy to grow and do not require special care. They are the most disease resistant rose on the market. They have stunning flower power with a generous bloom cycle (about every 5-6 weeks) that starts in Spring and will continue until the first hard frost. Knock OutRoses can fit into any landscape. Plant them individually among shrubs, annuals and perennials in mixed beds and borders. Plant them in large groups to create a colorful mass or in straight or curved rows to form a low-maintenance hedge. Typically, most higher maintenance, disease-prone roses aren't suitable for planting in front of the home, but Knock Out Roses hold up so well there isn't a problem with using them as colorful accents in foundation plantings.