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

When you’re ready to plant, dig a hole about two ... says Mortensen. Generally, Knock Out roses are less susceptible to diseases and pests that affect roses. During harsh summer conditions ...

This disease can spread from rose bush to rose bush so identifying and acting diligently is a must. At one time the Knockout Rose was thought to not be susceptible to this mite but has since been ...

Not only are Knock Out roses beautiful ... Further, as roses can be quite prone to disease, remember to clean and disinfect your shears or scissors between rose bushes to avoid spreading fungi ...

Its appealing characteristics are well documented — excellent disease resistance ... Fertilize the bushes immediately after this pruning. Knock Out roses and other repeat-flowering landscape ...

The Knockout rose is facing a serious viral disease called rose rosette. Once infected, a healthy plant starts producing Medusa-like bunches of new bright-red shoots. These shoots bloom ...

Another major selling point of Knockout roses is their resistance to disease. “Black spot is a common problem for roses, causing leaves to fall off,” says Reeves. “But Knockouts are highly ...

The problem is that they tend to be very susceptible to some foliar diseases, especially in our ... One of the first on the market was the Knockout roses. They have continued to develop and ...

a hedge of knockout roses. Typically deemed tough and disease-resistant, knockout roses are one of the best-selling landscape plants in the country — but even they are no match for the ...

They were also extremely resistant to insect and disease problems ... We always loved selling Knock Out roses, and we still do, because we knew it was a plant that would bring easy success ...