Richard Bogren , Gill, Daniel J. By Dan Gill. This rose has singlehandedly changed the market for roses since its introduction and ushered in a whole new way to look at roses and use them in our landscapes. Its outstanding characteristics are well documented — excellent disease resistance, more frequent reblooming, showy clusters of single cherry red flowers, dark green attractive foliage and a shrubby growth habit that works well in the landscape.
Knock Out roses, along with many other excellent rose cultivars in the landscape rose and old garden rose categories, tend to be used in landscape plantings like any other shrub. And they play that role very well. These plants are remarkably resilient in landscape planting. You will see black spot and yellowing leaves on occasion, particularly during rainy periods.
Powdery mildew may show up during ideal weather conditions. These roses, however, are resistant, not immune, to diseases. That means when more susceptible cultivars are having major disease problems, you will tend to see fewer disease problems on more-resistant types, like Knock Outs.
But under hot, humid, rainy weather conditions, even resistant rose cultivars will show spotting and yellowing leaves. 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. 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. Hope this helps! Can I trim and let them go dormant in my basement, plant in the spring? Or, should I plant asap? Hi Kris, I would get them into the ground asap.
They will have a much better chance of survival versus in the basement. Although I know some people have tried that, and it has worked for them. If you plant them now, they still have some time to get settled into their permanent home before the Winter. Plus the ground underneath stays warmer for awhile, so the roots can develop. I hope this helps! I bought knock out roses in June.
They are still blooming. When shall I prune them. They have grown so much. I hope it will help you! This is embarrassing. Just look at that rose bush! I measured it at a sprawling 9 feet tall. But wow, this one looks like a hot mess.
The beauty of Knock Out roses is that they can be pruned nearly any time without sacrificing beautiful blooms. This will be the largest flush of blooms. Then the plant will enter a resting phase and then burst with repeat blooms every few weeks. Maintainence pruning can be done during the resting phase. It is also a good time to cut off withered blooms, but not necessary. Heavy pruning though should be done in late February in warm, southern climates or in March for the moderate to cool climates.
The only time I do not recommend pruning is in the fall. It could trigger new growth that will not have time to harden before winter. One exception is if you live in the deep south then pruning any time of the year is acceptable. As a brand ambassador for Troy-Bilt, I have the opportunity to try and review a multitude of lawn and garden tools. Listed below are 3 of my favorite and most used pruning tools. Amazon affliate links provided for your shopping convenience.
When trimming roses for floral arrangements or controlling overall shape, I really love my Troy-Bilt Bypass Pruners. They are very sharp, cut through rose stems like butter and fit nicely in my hand. This particular lopper has adjustable telescoping handles, allowing you to easily prune thick, thorny branches without having to reach your hands inside the bush. This recommendation might surprise you but hedge trimmers can be used on Knock Out rose bushes.
Maintaining and shaping a rose hedge is easy when using this cordless hedge trimmer. How to Prune. Cut the stems back to a 5-leaf grouping or an outward-facing bud if pruning during the growing season. Remove and discard any dead, crowded, crossed or rubbing branches.
Tip: Wipe off the cutting blades of the pruner with antibacterial wipes before moving to a different rose bush. New growth has appeared within just one week since pruning. And here is the hedge after being trimmed with the cordless hedge trimmer. It needs a bit of fine tweeking with the hand pruner, but overal looks much better. Start fertilizing with a quality, slow release rose fertilizer in April or at the first sign of significant new growth.
In just a couple months the rose hedge will be bursting with blooms look even better than this! This post came at the right time for me, Kim! I just bought a pink Knock Out Rose for the very first time. Can I plant this in a large pot instead of the ground? I was hoping to put it out near the pool. Hi Nancie! Yes you can plant it in a large pot but be aware it will grow fast and you will have to trim it a few times during the summer to control and maintain the size and shape.
Congrats on the purchase… it will look gorgeous next to a pool. Absolutely gorgeous! I had a beautiful swath of these in a lower bed by my pool and sadly they were attacked by some disease in year 2 that looked like they had ginormous mud nests hanging from them and then the leaves were gone slowly and steady. Hi Lisa! That disease sounds awful!
Yes I would try them in a different spot for sure. Thanks so much! Have a great week! 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.
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