Knockout roses are one of the hardiest roses you can buy so it doesn't take a lot of work to keep them blooming from spring to fall. In fact, knockouts flower profusely every five to six weeks until the first killing frost of the fall. Most gardeners have around three different blooming cycles late spring/early summer to fall.
Knockouts don't require the same special attention that you need to give most species of roses. They are exceptionally resistant to pests and diseases and although they may occasionally have a problem, it will not usually be fatal. They can come back from many situations which other roses would not survive. They do well in both very warm and very cold environments.
Begin with soil preparation
In order to have roses that bloom well, you need to begin by planting them in a good location and preparing the soil. While most roses need around 8 to 10 hours of sun every day, this species can thrive on half that. Still, they do need sun so try and plant them where they can get a minimum of 4-5 hours of sunlight every day.
Add lots of organic matter to the soil when you first plant your knockout roses. They love compost and dried manures. If you wish, you can use a synthetic fertilizer but there are organic rose fertilizers at garden stores and nurseries. You could also make your own by looking for organic fertilizer recipes on the internet.
Deadheading knockouts
One of the characteristics that was bred into this species of landscape rose was the ability to drop off its dead blossoms. What can happen with many types of roses is that you have to deadhead them, which means pulling off the dead blossom so a new flower can grow. If you forget to deadhead, the rose produces seeds (rose hips) and stops blooming for the year.
While not needing to deadhead roses is a good quality, it can also slow down the ability of the rose to bloom again quickly. If you want to keep your knockouts blooming as often as possible, you can buy some more time by deadheading them. Even though they will eventually drop their dead blossoms, you can get ahead of the game by helping them out in this way.
Fertilize for more blooms
While knockout roses. do not need a lot of care, there is no doubt that paying more attention to their needs will increase their capacity to bloom and keep them blooming for a longer period of time. For instance, while it's good to fertilize your knock outs when you plant them, they will continue to bloom throughout the summer even if you do not fertilize them again.
Because blooms are so abundant, the rose plant does wear down a bit through the summer. And, while it will continue to produce new flowers, with a little extra fertilizer it will produce even more and better looking roses. Whether you add some 10-10-10 synthetic fertilizer or stick with organic alternatives, your knock out roses are bound to get a "pick me up" and burst forth with more flowers. Just remember not to add fertilizer until after their first blooming cycle.
Knockouts are great roses for beginners because they do require so little care. But, if you want to aim for the most possible blossoms and the best looking roses in the neighborhood, day in and day out, a little extra effort on your part will bring success.
