Knockout Roses Not Blooming

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knockout rose hedge

Knockout Rose Hedge

Knockout Roses are considered extremely easy to grow but like any plant in the garden their needs must be met. If your roses are not blooming or have decreased flowering there are a few simple ways to have them back in full color.  The most common reason for reduced flowering is lack of nutrients, especially with plants 3 years and older growing in poor soils.  The quick remedy for this is to fertilize the plants.  Start with a slow release rose fertilizer applied in mid-spring followed by a liquid feeding in mid-summer and again in late summer.    

The second most common reason that can cause Kncokout Roses not to bloom is plant size.  If the plants have been left to grow without any pruning  they will spend most of their energy on maintaining their size at the expense of flowering.  Knockouts do not need to be pruned as often as other roses but if you want to maximize their flowering potential it is best to prune the plants in late fall or very early spring.  Pruning will not only increase blooming but will help maintain the plants appearance and health.  

 The third tip for getting more blooms out of your Knockouts is to deadhead faded flowers – occasionally.  I know that all the marketing hype around the Knockouts claims that the flowers are “self-cleaning” and do not require deadheading.  It is true the flower petals will fall off all by themselves, but removing faded flowers is not the only reason for deadheading.  By pruning off the rose hips left behind after flowering you are removing the “seed pod”. Once the seed pod or hip is removed the plant can, and will, divert it’s energy from seed production to flower production.  You don’t need to run out with a pair of pruners every time a rose bloom fades but you will get better flowering if you deadhead 2 – 3 times per year.   

Knockout Roses are easy and will grow with basically no effort from the gardener, but why in the world would anyone choose to ignore such wonderful plants.   Give your plants the attention I described above and you will once again be rewarded with beautiful roses.  

     

 

  

Yellow Knockout Roses

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Sunny Knockout Rose - Yellow

Sunny Knockout Rose - Yellow

 

Yellow roses have always been one of my favorites.  They are easy to blend in with other flower colors and have a summer cheerfulness about them. Unfortunately there is only one yellow rose in the Knockout Family. The Sunny Knockout Rose which is  is a beautiful shade of buttery yellow and is the newest introduction from rose breeder Bill Radler introduced by The Conard Pyle Company in 2009. 

Sunny Knockout has the same characteristics of  all the other Knockout Roses with some very nice extras. The plants are more fragrant and a bit more compact.  The compact, tidy habit makes them perfect for tucking into small bare spots of the landscape  or as a low growing hedge.  The plants are very fragrant so plant a few close by so that you and anyone who passes by can enjoy the sweetly scented air. 

Sunny Knockout Rose   Rosa ‘Radsunny’   PP 18562: 

  • Introducer:  The Pyle Company
  • Breeder:  Bill Radler
  • Type:  Landscape Shrub Rose
  • Bud Form:  Pointed
  • Color: Bright yellow fading to softer hues of cream
  • Bloom Form:  Single
  • Bloom Size: 3″
  • Petal Count: 5-7
  • Fragrance:  strong / sweet rising from petioles not flowers
  • Habit:  Vigorous,  upright and compact
  • Foliage:  Dark green, semi-glossy
  • Disease Tolerance:  Very good
  • Flowering:  Generous bloomer from Spring until hard frost
  • Size: 1-4′ H  x  3-4′ W
  • Hardy / Zones:  5 – 9  ( 4 with winter protection)

I would like to explain the fragrance description above.  The Sunny Knockout Rose is without a doubt the most fragrant member of the family. However the flowers don’t get to take credit for it. The perfumed scent comes from the plants petiole which is the small stalk or stem that attaches the leaves to the stem.  If you are a hard core plant lover like I am you can learn more about the petiole here. 

We have The Sunny Knockout Rose on sale for half price at RosesKnockout.com 

Pink Knockout Roses

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Pink roses are a must have for anyone trying to achieve the “cottage garden” look.  The soft pastel pinks are calming and can tone down other colors that if left on their own tend to dominate the color scheme of a garden.  There are pink colored Knockout Roses than any other color in the group.  All of the pinks exhibit the same great qualities as any other color and are just as easy to grow.  I am especially fond of The Double Pink Knockout but then again I am partial to all double flowering plants.  I have taken the liberty to include The Rainbow Knockout Rose in my pink category even though it has a bright yellow center.  I recently saw a bed of  Blushing Knockouts planted in large groups with Munstead Lavender randomly planted among them. The color scheme as well as the vertical element of the Lavender was beautiful. 

If you are pondering which color of Knockout Roses you would like to have keep a few things in mind.  Red is a vivid color that stands out and demands attention.  Yellow is cheerful and mixes well with other colors but can be washed out in the bright summer sun. Pink is just bright enough to hold its own among other colors,  creates a nostalgic look and is a very easy color to design around.  See the list below for all the pink colored Knockouts available.

All Pink Knockout Roses are on sale for half price at RosesKnockout.com

The Pink Knockout Rose  Rosa ‘Radcon’  PP 15070

  • Introducer:  Conard Pyle Company
  • Breeder:  Sport of the original Knockout ‘Radrazz’ discovered growing at the nursery of Conard Pyle   (note: see below for definition of a sport)
  • Rose Type:  Landscape Shrub Rose
  • Bud Form:  Pointed ovoid
  • Bloom Color:  Bright Pink with hints of white as the blooms age – clusters of 3 -5 with up to 38 blooms per branch
  • Flower Form:  Flat cup
  • Petal Count:  7 – 11
  • Bloom Size:  3″
  • Fragrance:  none to very slight
  • Habit: Vigorous, bushy, mounded
  • Foliage:  Deep green with wine red new growth
  • Disease Tolerance:  Very good
  • Size:  3-4′ H  x 3-4′ W
  • Hardy / Zones:  5- 9  ( 4 with winter protection)

The Pink Double Knockout Rose   Rosa ‘Radtkopink’  PP 18507

This rose is considered to be the most drought and heat tolerant of all the Knockout Roses once it establishes itself in the garden.  This tough characteristic makes this shrub rose  very popular with landscape designers who want to add color to spots they know will not get tended to properly.

  • Introducer:  Conard Pyle Company / Star Roses / Novalis
  • Breeder:  William Raddler and Imperial Nurseries
  • Rose Type:  Landscape Shrub Rose
  • Bud Form:  Pointed ovoid
  • Bloom Color:  Bubble Gum Pink with paler hues as the blooms age – clusters of 3 -5 with up to 10 blooms per stem
  • Flower Form:  Double
  • Petal Count:  18 – 24
  • Bloom Size:  3.5″
  • Fragrance:  slightly spicy, light tea rose
  • Habit: Vigorous, compact, bushy, mounded
  • Foliage:  Deep green that turns to maroon in fall
  • Disease Tolerance:  Very good
  • Size:  3-4′ H  x 3-4′ W
  • Hardy / Zones:  5- 9  ( 4 with winter protection )

The Rainbow Knockout Rose   Rosa ‘Radcor’  PP 17346

This rose is the most compact grower of the Knockout Rose Family and in my opinion has the best fall foliage colors. Rainbow Knockout was the winner of The All American Rose Selection in 2007.

  • Introducer:  Conard Pyle Company / Star Roses
  • Breeder:  William Radler
  • Rose Type:  Landscape Shrub Rose
  • Bud Form:  Pointed
  • Bloom Color:  Coral Pink with yellow centers – clusters of 3 -5 with up to 38 blooms per branch
  • Flower Form:  Single
  • Petal Count:  5 – 7
  • Bloom Size:  2″
  • Fragrance:  none
  • Habit: Vigorous, bushy and rounded
  • Foliage:  Deep green, glossy
  • Disease Tolerance:  Very good
  • Size:  3-4′ H  x 3-4′ W
  • Hardy / Zones:  5- 9  ( 4 with winter protection)

The Blushing Knockout Rose   Rosa ‘Radyod’  PP 14700

This a very nice shrub rose with softer pink blooms than the other pinks.   The blooms start off  light shell pink and gradually fade to a softer, delicate shade of pink.  Blushing Knockout is probably the best selection for gardeners who are trying to achieve the cottage garden look.

  • Introducer:  Conard Pyle Company / Star Roses in conjunction with Blooms of Bressingham
  • Breeder:  Sport of the original Knockout ‘Radrazz’ discovered growing at Yoder Brothers Nursery in PA
  • Rose Type:  Landscape Shrub Rose
  • Bud Form:  Pointed
  • Bloom Color:  Light pink that softens as the blooms age – clusters of 3 -5 with up to 30 blooms per stem
  • Flower Form:  Cup single
  • Petal Count:  7 – 11
  • Bloom Size:  3.5″
  • Fragrance:  slight
  • Habit: Vigorous, bushy, mounded
  • Foliage:  Deep green with wine red new growth
  • Disease Tolerance:  Very good
  • Size:  3-4′ H  x 3-4′ W
  • Hardy / Zones:  5- 9  ( 4 with winter protection)

You may have noticed that two of the pink colored Knockout Roses where referred to as sports as the breeder.  A sport is a plant that has mutated on it’s own with out the help of a breeder.  Sports are often discovered at nurseries growing among the rest of the crop. If the mutation produces qualities that are unique or desirable the new plant will be reproduced and made available to the gardening public.   There are countless numbers of plants that where developed from sports.  There is one drawback to any plant produced from a sport, they can sometimes revert back to the original parent plant.

We have all the pink colored Knockout Roses at RosesKnockout.com for half price.

Knockout Red Roses

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The Red Knockout Roses

The Red Knockout Roses

 

When most of us think about roses we immediately think of the beautiful red flowers. Red is the classic rose color and has been for well over a hundred years.  While the Knockout Red Roses are not the typical rose you would send to your sweetheart they are darlings in the garden. 

The Knockout Family has two red members and they are both wonderful plants. The very first Knockout Rose was red and then later came her sister The Double Knockout Rose.  Both of these shrub roses exhibit great resistance to insects and diseases such as black spot that is a common enemy to nearly all rose bushes.  Double Knockout has faint hints of pink around the edges of the flower petals but it’s overall appearance is bright red. 

The Knockout Rose   Rosa ‘Radrazz’  PP 11836:
This is the rose that turned the gardening world on it’s ear.  Introduced in 2000 in which it won the coveted All American Rose Selection, this red rose became the fastest selling rose of all time.  Over 250,000 plants sold in the first year with the count in the millions today.  This Knockout Rose set the standard for breeders across the globe who where focusing their efforts on disease resistance, bloom cycle, hardiness and low maintenance roses.  

  • Introduced by:  The Conard Pyle Co.
  • Breeder: William ‘Bill’ Radler
  • Rose Type: Landscape Shrub Rose
  • Bud Form: Pointed ovoid
  • Bloom Color: Cherry Red in clusters of 3 – 5
  • Petal Count:  5-7
  • Flower Form:  single
  • Bloom Size:  3.5″
  • Fragrance: Light Tea
  • Bush Size: Small ( 3 -4′w x 3- 4′h)
  • Habit: Vigorous, compact mound and bushy
  • Foliage:  Deep green with blue and maroon highlights, under side of leaves are maroon
  • Disease Tolerance:  Very good
  • Flowering:  Very generous bloomer with flowering cycles from spring until frost
  • Hardy / Zones:  5 – 9   (will grow in zone 4 with winter protection)
  • Plats are self-cleaning, no need for deadheading spent blooms

The Double Knockout Rose   Rosa ‘Radtko’  PP 16202:
Bill Radler produced the double flowering Knockout from the same cross he made to produce his first Knockout Rose.  The Conard Pyle Company, the nursery in charge of managing the Knockout Rose cultivars,  quickly rolled this new introduction and stated that it represented the next generation of the Family of Knockouts.  Just as the name suggest the flowers are double with an extra row of petals that give the bloom a ruffled full appearance.  The flower form may have changed put the performance of the plant remained the same. Double Knockout is just as easy to grow, resists disease and pests, is low maintenance and flowers it’s head off.   There where two improvements, Double Knockout will tolerate more shade than it’s parent and is more fragrant!  

  • Introducer:  The Conard Pyle Co.
  • Breeder: William Radler
  • Rose Type:  Landscape Shrub Rose
  • Bud Form:  Pointed ovoid
  • Bloom Color:  Bright Red with faint hints of pink in clusters of 3-5
  • Bloom Size:  3″
  • Petal Count:  18 – 15
  • Flower form: Double
  • Fragrance:  Light teas rose,  slightly spicy
  • Habit:  Vigorous, compact mounding and bushy
  • Foliage:  Deep green with maroon highlights
  • Disease Resistance:  Very good
  • Flowering;  Flowers in cycles from spring until frost
  • Size:  3-4′ h  x 2-4′ w
  • Hardy / Zones:  5 – 9  ( will survive in zone 4 with winter protection)

I once was told by a lady who introduced me to gardening that no garden was complete without at least one red rose.  I think she may have been right. 

We offer both The Red Kockout Rose and The Double Knockout rose at a 50% discount at RosesKnockout.com 

Knockout Rose Varieties

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RosesKnockout.com

RosesKnockout.com

Since the first Red Knockout Rose was introduced by Conard-Pyle Nurseries in 2000 their have been six new varieties introduced.  The rose that took the world by storm is now available  in shades of pink, yellow and two double flowering varieties. Each one offers the same attributes as the parent with some improvements in flowering, fragrance and shade tolerance. That’s right, believe it or not these incredible shrub roses will grow in partial shade something you could never do with the modern Hybrid Teas.  The Knockout Rose varieties are listed below in chronological order along with their patent numbers and cultivar names which I will explain in a minute.

  • The Knockout Rose   Rosa ‘Radrazz’   PP 11836
  • The Double Knockout Rose   Rosa ‘Radtko’    PP 16202
  • The Pink Knockout Rose   Rosa ‘Radcon’  PP 15070
  • The Pink Double Knockout Rose   Rosa ‘Radtkopink’  PP 18507
  • The Rainbow Knockout Rose   Rosa ‘Radcor’  PP 17346
  • The Blushing Knockout Rose  Rosa ‘Radyod’  PP 14700
  • The Sunny Knockout Rose  Rosa ‘Radsunny’  PP 18562

The same breeder, Bill Radler who created the Knockout Roses listed above has released a new white shrub rose this year which he named ‘White Out’.  This new white rose has caused a bit of confusion for many gardeners who mistakenly assume that White Out is a Knockout Rose.   White Out has several great characteristics of Mr. Radler’s family of Knockout Roses but this new white is not as cold hardy and therefore did not make it’s way into the family. So when someone tells you there is a White Knockout you will know the facts and can gently let them down.

I am sure you noticed the funny sounding names beside each Knockout Rose variety.  These are the cultivar names and every rose on the market has one.  The American Rose Society  is in charge of name registration and sees to it that names and descriptions of new cultivars are unique and correct.  The ARS does not create the names or the descriptions, this is usually done by the person who bred the rose. The term Rosa in front of the cultivar name is the botanical name for Roses.  After the name is established most breeders allow commercial growers to mass produce the rose.  If you are wondering where the word Knockout fits into this naming sequence,  well that’s the duty of the marketing department. It’s a lot easier to sale a rose named Pink Knockout than it is Rosa ‘Rdcon’.

You can find all of the Knockout Rose varieties at RosesKnockout.com