These are the three Knockout Roses in one of our foundation beds, as they looked last Fall. I prune them every year, and they grow back nice and full, almost looking like one giant shrub. And here is the freshly pruned shrub.
There are no crossing branches left and all spindly branches are gone. This particular shrub is always the tallest, between 5 and 6 feet high. I pruned this shrub down to about 3 feet. Below is the Knockout Rose in our lamp post bed. This photo was taken in early December, when we actually still had a couple of blooms here and there.
I felt this particular shrub was very scraggly and just looked sad by the end of the season. It was no longer full, and this was the second year it looked like this. This shrub was a perfect candidate for a rejuvenation pruning. I cut it down to about 12 inches in height, and look forward to seeing how it bounces back.
Use Rose-tone by Espoma on your Knockout Roses. After pruning, sprinkle the Rose-tone around the bushes and work it into the soil just a bit. If you have mulched gardens like we do , then sprinkle more than usual to make sure enough of it will work its way below the mulch and into the soil. Otherwise, if no rain is in the forecast, make sure to water the fertilizer after application. I prefer the granules versus the spray. Rose Rosette Disease is spread by a tiny mite. The disease causes vigorous growth of all or part of your Knockout Roses.
The foliage becomes distorted and the flowers look very different than usual. Pruning your roses in Spring may help remove any mites that overwintered on the bushes.
Do you need to deadhead your Knockout Roses? No, according to the company which developed these roses. However, even they admit that your roses will look better if you remove the spent blooms. This article talks about whether or not you need to, and then I show you how I deadhead my roses using step-by-step photos.
I just bought 4 knockout roses….. Hi Sandra, I would wait to plant them until September when the temperatures cool down a bit. Just keep the roses watered well for now, and they will do ok in their pots. But the plants will recover and be fine without fungicide treatments. Once established, they are remarkably resilient and drought-tolerant. Notice the Knock Out roses thriving around gas stations. They do not need or want to be pampered. One issue, however, is size. Many people purchase this plant with a tag that indicates the mature size at about 4 feet tall and wide.
In fact, they can easily grow to 6 by 6 feet or more. The good news is that pruning them is not difficult and, done about twice a year, will help keep your bushes more compact. Like all everblooming roses we grow in Louisiana hybrid tea, grandiflora, floribunda, China, noisette, tea, Bourbon, landscape roses, miniature roses and others , Knock Out roses should receive two major prunings a year.
Use sharp bypass-type hand pruners when pruning roses. They make clean cuts and minimize damage to the stems. Wear a sturdy pair of leather gloves and long sleeves because no matter how careful you are, thorny roses can painfully puncture or scratch your hands and arms. Should you need to cut canes larger than one-half inch in diameter, you should use loppers.
The first pruning is done anytime from late January to mid-February. Pruning any later will delay the outstanding spring and summer flowering. There is no set way to prune a Knock Out rose or other landscape roses. It depends entirely on the desires of the gardener and the situation.
If you want your roses to grow large to form a screen, you would do only light pruning and cut out any dead wood. In a situation where the bushes have grown too large, decide what size they need to be for the location.
Cut the bushes back about 1 foot shorter than you want them to be within reason, you should never cut them back shorter than 2 feet tall. A general recommendation for the late-winter or early spring pruning is to reduce the height of the bushes by about one-half to one-third. I have 7 double knockout roses that are 5 ft wide and 6 foot tall!! They keep getting these large heavy clusters on them.
How can I trim them and make them healthy here in the Arkansas heat,. Hi Tracy! I dedicated a paragraph in that blog post towards talking about when exactly to prune and how much. Go ahead and cut off the heavy clusters and bring them inside to enjoy. Light pruning is fine right now. Happy Gardening! Hi, I live in Oregon, in the Willamette valley, we have clay soil, never been planted with anything. Want to do roses. Not sure which type. Hi Melinda!
In your area, you can plant any rose you would like. Knockouts are the easiest to grow, are very disease resistant and grow fast! How short can you cut knock out roses back and whats the best time of year to do so I live in Houston, TX? Hi Steve! You can trim them back at any time during the year in Houston. I just recommed that if you want to do severe pruning that you wait until late February in your area.
PS- keeping your city in my prayers. Warm Regards, KIM. I am in Central Texas and I pruned my knockout roses in January. Do you know how long it will take for them to grow and bloom? Is there anything I need to do to help them? Hi Susan! You all had quite a drop in temps a few weeks ago too.
They will be start putting out new growth soon. When you start seeing new growth add a granulated rose food fertilizer around the base of each rose plant and work it into the top few inches of soil. Best, KIM. It is the beginning of August and my knock out roses are not looking real god; they are 11 years old and the bases are thick and white looking should I prune them real low are just remove them and plant new oness.
Hi Betty! Have you pruned them lately? You can do that right now even and will have a beautiful flush of blooms come fall. The white thick bases are a sign of age. They might be on their last legs. Hope that helps! Hello, I love the information you have given on Knock Out Roses. My question is do you fertilize more than once a year and what type fertilizer, 3 month, 9 month etc.? Thanks Teresa! I personally only fertilize knockouts in the early spring with a slow release granular rose fertilizer which I work into the soil around the base.
I live in PA, zone 5. I have 4 knock outs — 2 are 6 years old, and the other 2 are only 2 years old. I was intending to prune them before the first frost, but time has gotten the best of me.
We had a mild frost last week, and then this am, it was 29 degrees, so obviously there was a glistening of the white stuff in the grass and on the cars this morning! My roses are about feet tall, x feet wide. Do I prune a little now, and then do it again in the Feb of , or at this point, do I just wait until Feb to take them down to about 30 inches so that they will then be about 3 or 4 feet tall during next summer?
Should I wait until Feb to do this? Thanks in advance! Hi Laura! Thank you so much for this question!
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