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

such as hybrid tea roses, do. They have a long bloom time and few problems with diseases or pests. Knock Out Roses, which were introduced in 2000, come in a variety of sizes, ranging from 18 ...

Its appealing characteristics are well documented — excellent disease resistance ... their easier care and attractive growth habit, Knock Out roses, along with many other landscape roses ...

Clippings left near the base of the plant could harbor disease so it's best to clean it up. Lack of sunlight is likely the cause of limited flowering. Knock Out roses need six to eight hours of ...

It is an awesome landscape shrub rose with either single or double blossoms exhibiting disease tolerance and a long blooming cycle offering a mild, spice tea fragrance. The Knockout rose was first ...

The yellow leaves are likely due to heat stress, although black spot disease is possible. Even resistant roses like Knock Out will get some black spot during summer — particularly if the foliage ...

Insects and diseases are typically the biggest challenges related to roses. Roses go through a two-year rating testing process by the American Society of Roses. The test results of the Knock Out ...