Why Are My Knockout Roses Not Blooming and How To Fix It?
Roses have always been finicky. For some people with especially green thumbs, they seem to grow themselves, but for most, roses can have a personality as prickly as their stems.
Knock Out Archives
William Radler developed the Knockout Rose in 1989.
The Knock Out Family of Roses is Radler’s crowning horticultural achievement. He has been a rose enthusiast since the age of nine and is now in his 70s.
He began trying to develop an easy-care rose at a very early age. In fact, he says that fixing roses was one of his first horticultural goals.
Radler approached the problem in a unique way by selecting and propagating roses for hardiness and disease resistance first and flower production second.
He began his project in 1974 and only began meeting with success in the late 1980s when he developed the strain he labeled 89 – 20.1.
This proved to be the breakthrough rose that was easy to grow, disease-resistant, and capable of producing billowing clouds of lovely, pinkish-red roses throughout the entire summer.
It was not until the early 1990s that Radler’s new strain of rose took off and attained the name “Knock Out”.
In 1992 a company known as Star Roses & Plants near Philadelphia signed a contract with Radler to begin testing on his new rose, a process which took eight years.
With the required testing complete, the company filed for a patent and named the new, easy-care rose Knockout. Sales began in the year 2000.
It became quickly apparent that Knockout Rose bushes would be wildly popular. In fact, the stellar performance of the Knockout Rose bush allowed it to be named the All American Rose Selections winner in the year 2000.
Today, with over 90 million plants sold, they have made Radler a wealthy man. These easy-care roses are now available in seven different varieties in nurseries and home improvement centers across the nation.
The All America Rose Selections committee named the original red shrub Knock Out® rose one of its winners in 2000. Soon Knock Outs became the best-selling new rose on the market.
Today the family of Knockout roses is still one of the most popular roses in North America.
Knockouts are known for their resistance to disease, vibrant colors, and hardiness.
Currently, there are 11 varieties in the Knock Out® Rose family.
- ‘Radrazz’ – the original Knock Out® Rose – cherry red to hot pinky
- ‘Radcon’ – Pink Knock Out® Rose – bright pink
- ‘Radtkopink’ – Pink Double Knock Out® Rose – pink double-flowers
- ‘Radyod’ – Blushing Knock Out® Rose – light pink
- ‘Radcor’ – Rainbow Knock Out® Rose – coral pink with yellow center
- ‘Radsunny’ – Sunny Knock Out® Rose – yellow fades to cream
- ‘Radral’ – Coral Knock Out® Rose – brick orange fading to coral
- ‘Radgor’ – Peachy Knock Out® Rose – shell pink with yellow center
- ‘Radwhite’ – White Knock Out® Rose
- ‘Meibenbino’ – Petite Knock Out® Rose – dwarf, bright red
These roses are tested and evaluated for insect and disease resistance, repeated blooming, winter hardiness, and many other desired qualities.
How To Get Rid Of Rose Slugs On Knockout Roses?
One of the biggest mistakes people make when purchasing any of the Knockout Rose varieties is to think they are immune to problems. Knockouts are highly adapted roses have been
What Causes Yellow Leaves on Knockout Roses?
Knockout Roses are landscape roses that take a lot of stress and worry from rose gardening. Even so, these practical, hardy roses may occasionally present with yellowing leaves. The leading
Growing Radcor Rainbow Knockout Roses
Perhaps no other perennial flower has captivated the world as much as the rose. These plants have been the subject of countless cultivars over the years. From the crimson red
How To Grow and Care For Coral Knock Out Rose
The Coral Knockout Rose ‘Radral’ is unusual among roses for quite a few reasons. For one thing, it can grow quite well in partial shade. The flower coloration changes as
Knockout Roses Bug Spray: What Is A Good Safe One?
One of the biggest mistakes people make when they first buy a Knockout Rose is to think these roses are immune to everything. It’s true they need less maintenance than
Growing And Care Of Pink Knockout Rose – Rosa Radcon
It’s been 20 years since the original Knockout Rose was first introduced, and it’s more popular than ever. With colors ranging from red and pink to even yellow, these roses
What Causes Yellow Leaves on Knockout Roses?
Knockout Roses, aka Rosa Knockout, are characterized by their cluster of low-maintenance shrubs that contain single or double rose flowers that generally bloom into blush or vibrant red color with
Grow and Care Of Knockout Roses In Zone 8
Growing Knockout Roses in zone 8 could be the ideal place. The warm temperatures of Zone 8, allow for pruning and planting options. We discuss when to plant, When to Prune, Japanese beetles and more.
Will Knockout Roses Grow In Shade – Do They Bloom?
One of the biggest draws to the Knock-Out Rose isn’t its lush growth or beautiful blooms. It’s the fact that they are far easier to maintain than ordinary roses and
Tips On Getting Rid Of Powdery Mildew On Knock Out Roses
Homeowners and landscapers love Knock Out Roses for their low maintenance and bright blooms but Knock Outs can suffer from powdery mildew. This article shares tips on controlling powdery mildew on Knockouts. [DETAILS]
How To Transplant Knockout Rose Plants
When transplanting Knockout Roses follow a few rules for success. When moving a plant expect some transplant shock. Pruning, timing, and location are all important. CLick on this article to learn more about transplanting Knock Out Roses.
Knock Out Roses Diseases: What Is Killing My Knockout Roses?
Knock Out Roses are extremely low maintenance and resistant to many rose maladies but Knockouts are not completely immune. If your Knockout Roses are have some disease problems. This article can help.
Knock Out Rose Rosette Disease: Controlling Witches Broom Disease
While it’s a myth that everyone loves roses, they remain one of the most popular and expressive flowers a plant lover can grow. In recent years, a new type of
11 Popular Knockout Rose Varieties: Get To Know These Beauties
Rosa Radrazz (RO-suh RAD-razz), or Knockout Rose, is the first in a group of carefree, disease tolerant, hardy types of roses introduced in 2000. All of these roses are happy
Are Knockout Roses Cold Hardy – How Much Cold Will Knockouts Take?
The Knockout family of roses come in a variety of colors and are some of the most popular flowering plants on the planet. Knockouts are highly popular for their repeat
Tips On Growing Knockout Roses In Zone 7
There are 11 official varieties of disease-resistant Knock Out Roses, all of which can be grown from USDA hardiness zones 5 to 9. Knock Out Roses care is low for
Knockout Roses Care: [5 SMART TIPS] For Growing Beautiful Knock Out Roses
Knock Out® Roses are known for its easy care, disease resistance and many other qualities. Learn more about this rose many believed “saved the rose industry.”
How To Grow And Care For Petite Knockout Rose
The Petite Knockout Rose is the miniature version of the Knock Out Rose cultivar bred by William Radler. Alain Antoine Meilland, a well-known rose breeder of the House of Meilland
How To Get Rid of Japanese Beetles on Knockout Roses
Measuring only ½” of an inch in length, Japanese beetles are little creatures that love to munch on over 300 species of plants, and one of their favorite treats? Knockout
Tips On Growing The Pink Double Knockout Rose
When the original Knock Out Rose was introduced in 2000, the All American Rose Selection created waves among gardening enthusiasts as the first low-maintenance rose hybrid. As of 2020, there
Can You Grow Knockout Roses In Zone 5?
Cold-tolerant Knockout Rose shrubs are typically winter hardy to USDA hardiness zone 5. With a few extra steps, you may be able to protect your roses in even cooler climates.
Growing The Yellow Knock Out Rose
Knockout roses are a beautiful, lower-maintenance alternative to the classic rose. Easy to grow and not too picky, these beautiful flowers will bloom all season long with no complaint. The
Tips On Growing Knockout Roses In Containers
Knockout roses are a fantastic, sturdy variety of rose developed by William Radler. Since 2000, when knockout roses became commercially available, they have bloomed in popularity. Serving as an attractive,
Fertilizing Knockout Roses: How To Tips | Recommended Fertilizers
The patented Knock Out Rose is a family of compact rose bushes and a few tree variants best known for their low maintenance requirements and disease resistance. The red flower
When Do Knockout Roses Start Blooming?
Knockout roses care is low-maintenance. This hardy rose is an ideal shrub even for gardeners with limited experience. This family of roses produces vivid red, yellow, or pink rose blossoms
Knockout Roses Winter Care Tips: Pruning | Mulching | More…
Like every other aspect of Knockout Rose care winter care of Knockouts is simple and straightforward. The Knock Out rose introduced by Will Radler in 1989 is very hardy in
Double Knockout Roses Care: All About Growing Double Knockout Roses
The Double Knock Out Rose [Rosa ‘Radtko’] is a further modified version of the hybridized Knock Out Roses first introduced in 2000 by Wisconsin rose breeder, William Radler. It is
How To Prune Knockout Roses – [5 Video Tips]
Do you know how to prune knockout roses? The family of Knockout® roses is one of the hottest plants to hit the market in the last few years. The Knock-out