Bedding rose

20-935-1
20-935-2

Double Knock Out®

Knock Out®

RADtko – William J. Radler

Vibrant, pure cherry red with a saturated warm red shade. - landscape shrub rose - very weak, barely perceptible scented rose - sweet fruity aroma

– Continuous cherry red colour all season.
– Dense, bushy habit for fast ground coverage.
– Exceptional disease resistance in landscape use.
– Heat and moderate drought tolerant once established.
– Minimal maintenance, self-cleaning flowering shrub.
– Special feature: Decorated with major sustainability awards for reliable performance in tough sites.
Project (landscape architecture / mass use)
Double Knock Out®
pharmaROSA® NEONATAL rooted rose cutting
30,87 £
Due to courier service regulations – and the introduction of customs clearance – delivery to Ireland is temporarily suspended.
3.5 (5111)
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DOUBLE KNOCK OUT® – red landscape shrub rose – RADtko

Uniformity and coverage define DOUBLE KNOCK OUT® as a project‑grade landscape shrub for high‑volume mass planting, where remontant flowering and reliable resistance support predictable scheduling and minimal in‑season intervention. As pharmaROSA® NEONATAL own‑root material, it offers long‑term stability, regenerative longevity and homogeneous blocks that underpin low replacement in nursery propagation beds and 1.5–2 L landscape lines. Developed for project mass planting routes into urban green space, parks and edging, its compact, bushy habit and dense foliage suit mechanised handling and quick bench turnover, while a heat‑ and drought‑tolerant profile remains dependable across UK sites, including demanding west‑coast conditions with elevated humidity. With year‑one root establishment, year‑two structural build and year‑three full ornamental expression, you can phase capacity and call‑off to match project specifications and long‑term maintenance obligations.


Usage options

Target area Reasoning
Mass‑market nursery lines for project landscaping The core strength is fast ground coverage from a compact, bushy plant that quickly fills 1.5–2 L containers into a uniform, dense, bush‑trained finished product suitable for project mass planting. In practice this supports fast bench turnover and reliable grading for flowerbed and park lines, matching positioning for large‑scale landscape architecture / mass‑use schemes. Own‑root form stabilises renewal and lifespan, giving wholesalers consistent blocks to re‑order for landscape contractor supply.
Public‑realm and municipal schemes High disease resistance, including resistance to powdery mildew, black spot and rust, translates into low maintenance loads and predictable performance under municipal care regimes with minimal skilled pruning. Recommended as a low‑maintenance project mass‑planting shrub for urban green spaces, edging and hedging, it aligns well with park and streetscape contracts where visual uniformity and reduced chemical intervention support long‑term budgets, particularly on exposed, humid western UK sites. This reliability is attractive for public‑realm framework partners.
Colour‑driven flowerbed and bedding ranges Vibrant cherry‑red colour, with good presentation from newly opened buds through uniform full bloom, gives a strong visual block in bedding and flowerbed concepts. The compact 85–115 cm habit and cluster‑flowered, cup‑shaped blooms allow dense planting in project mass planting schemes, while the recommended 1.5–2 L pot keeps transport and display efficient. This colour impact, combined with uniform, dense branching, underpins ranges designed as fast‑coverage, high‑impact solutions for project‑serving wholesalers.
Extended‑season landscape offers Remontant flowering with abundant second flush supports an extended sales and planting window, reducing risk around specific delivery weeks. In production, rooted cuttings can be scheduled so that 1.5–2 L bush‑trained stock reaches consistent bud and foliage stages for phased call‑offs into park, urban green space and hedge projects. Continuous repeat flowering helps fulfil specifications for long display periods in thematic rose displays and mixed landscape schemes, adding value for integrator‑type nursery networks.
Low‑input, resilient plant programs Once established, good heat and moderate drought tolerance, combined with H7 winter hardiness and Swedish Zone 4 rating, make this cultivar a robust option for low‑input planting schemes. In nursery production, this resilience allows more secure outdoor standing and simplifies watering regimes for 1.5–2 L crops, supporting reliable grading for flowerbed and shrub‑group projects. Such tolerance reduces replacement risk in large installations, an asset for maintenance‑oriented contractors.
Hedge and edging production lines The even 85–115 cm height and spread, together with dense foliage and moderately thorny shoots, lend themselves to low, informal hedges and edging. As uniform, dense, bush‑trained finished plants from small containers, they can be planted in linear schemes where rapid canopy closure is key. Own‑root material maintains structure and fill‑in over time, supporting long hedge runs in commercial and public‑realm projects served by wholesale consolidators.
Container and large‑tub landscape supply Dense branching and self‑cleaning flowers create tidy presentation in containers, reducing grooming time during holding and retail‑style display. While the recommended core route is 1.5–2 L for mass planting, plants can be stepped up into 40–50 litre containers or larger tubs to supply high‑impact shrub groups for civic entrances and institutional sites. Repeat flowering and clean foliage maintain visual value over longer holding periods for cash‑and‑carry depots.
Thematic and sustainability‑focused rose collections Awards such as Australian Gold Medal, A.R.T.S. Master Rose and UC Davis WUCOLS Blue Ribbon confirm its performance in sustainable, low‑input contexts, reinforcing its suitability for rose collections and demonstration plantings focused on resilient cultivars. As pharmaROSA® NEONATAL own‑root stock, it fits cultivar maintenance beds and show‑garden style stands, where identity, long‑term stability and predictable regeneration matter as much as uniform finished form for curated collection suppliers.

Finished-product ideas

  • Project Red Mass Bedding 2L – Uniform 1.5–2 L bush‑trained plants selected for fast ground coverage and vibrant cherry‑red colour, aimed at high‑volume project mass planting for parks and flowerbeds – landscape contractor and framework wholesaler ranges.
  • Urban Edge Hedge Line – Compact, dense plants graded for consistent 85–115 cm habit, optimised for edging and low hedges where low maintenance and strong disease resistance are priorities – municipal and commercial landscape specification supply.
  • Resilient Rose Park Mix – Double Knock Out® grouped with comparable resilient shrubs in 2 L containers, offering repeat flowering, own‑root longevity and good heat/drought tolerance for low‑input park and urban green‑space schemes – public‑realm project tenders.
  • Large-Tub Cherry Accent – Step‑up plants from 2 L into 40–50 litre tubs to deliver immediate volume, dense foliage and remontant cherry‑red clusters for entrances and plaza plantings – institutional, hotel and corporate landscape contracts.
  • Awarded Sustainable Rose Collection – Curated batch highlighting A.R.T.S. Master Rose and UC Davis WUCOLS recognition, produced as uniform, dense shrubs for thematic and show‑garden installations demonstrating sustainable, low‑input landscape roses – specialist collection and display garden supply.

Technical cultivar profile
Parameter Data
Name and registration Modern shrub (landscape shrub) rose, registered as RADtko, traded as Double Knock Out®, within the Knock Out® collection; exhibition category shrub rose for landscape and display plantings.
Origin and breeding Bred by William J. Radler in the United States from ‘Bucbi’ seedling × ‘Razzle Dazzle’ seedling; introduced 2004 by Conard‑Pyle (Star® Roses and Plants), with US plant patent granted 2006.
Awards and recognition Australian Gold Medal 2004, American Garden Rose Selections (AGRS) Regional Award 2018, American Rose Trials for Sustainability Master Rose 2019, UC Davis WUCOLS Blue Ribbon™ 2017.
Growth and structural characteristics Compact 85–115 cm height and spread, bushy habit with dense, slightly glossy purplish‑green foliage, moderately thorny shoots and good natural self‑cleaning that limits deadheading labour.
Flower morphology Semi‑double, cup‑shaped flowers with 13–25 petals, medium size at 1.5–2.75 inches, produced in clusters, repeating well with abundant second flowering for strong seasonal ornamental presence.
Colour data and phenology Vibrant cherry‑red blooms, ARS code mr, RHS 53C outer and 53A inner, opening intense then gradually lightening towards pinkish tones; outer petal edges paler at full bloom, moderate colour retention overall.
Fragrance and aroma Very weak, barely perceptible scent with a sweet fruity character; semi‑double flowers moderately attract pollinators due to accessible stamens, giving partial pollinator‑friendly value in plantings.
Hip characteristics Hip set generally sparse; when present, produces small spherical hips 6–10 mm in diameter, orange‑red in colour and potentially of minor ornamental interest in mixed shrub plantings.
Resistance and winter hardiness High resistance to powdery mildew, black spot and rust; hardy to approximately −26 to −23 °C, RHS H7, Swedish Zone 4, USDA Zone 5b, with good heat tolerance and moderate drought tolerance once established.
Horticultural recommendations Suited to flowerbeds, parks, urban green spaces, edging, hedges, container use and shrub groups; low maintenance requirements and minimal care make it ideal for project mass planting and landscape contracts.

DOUBLE KNOCK OUT® offers fast coverage, high disease resistance and compact, uniform architecture on a predictable own‑root platform, supporting durable, low‑replacement blocks for nursery and landscape supply; please contact us to align capacities and scheduling.

Detailed product attributes

Product Identification Data

Product Name: DOUBLE KNOCK OUT® – red landscape shrub rose - Radler
Product Type: pharmaROSA® NEONATAL - rooted rose cutting
Cultivar Authenticity: Verified:13.06.2025
Cultivar Quality Rating: premium gold
Item Number: [870] 20-935 (14.02.2026) pharmarosaneonatal.co.uk

Name and Registration

Meaning of Cultivar Name: The name denotes the fuller, 'double'‑flowered form of the Knock Out® series, referring to the boxing term 'double knock‑out'.
Cultivar Synonym: Double Knock Out®
Original Trade Name: Double Knock Out®
Current Trade Name: Double Knock Out® Knock Out® RADtko
Rose Group: Modern Shrub (Landscape Shrub)
Commercial Type: landscape shrub rose
Commercial Group: Bed rose
Exhibition Category: shrub rose; landscape and display plantings
Collection: Knock Out®

Origin and Breeding

Initial Distributor: Conard -Pyle (Star® Roses and Plants) (USA)
Registration Year: 2004 (US PP16 202, patent granted 2006)
Breeder: William J. Radler
Breeding Company / Institution: CP Delaware Inc; The Conard -Pyle Company (Star® Roses and Plants)
Breeding Year: United States, 2000
Parentage: ‘Bucbi’ seedling × ‘Razzle Dazzle’ seedling

Awards and Honours

Horticultural Ratings and Recommendations: American Rose Trials for Sustainability (A.R.T.S.) Master Rose (2019); UC Davis WUCOLS Blue Ribbon™ (2017)
Competition and Show Awards: Australian Gold Medal (2004); American Garden Rose Selections (AGRS) Regional Award (2018); American Rose Trials for Sustainability (A.R.T.S.) Master Rose (2019); UC Davis WUCOLS Blue Ribbon™ (2017)

Growth and Structural Characteristics

Height: 2.8-3.8ft (85-115 cm)
Spread: 2.8-3.8ft (85-115 cm)
Growth Habit: bushy (bushy growth habit)
Foliage: The variety has dense foliage. Its leaves have a slightly glossy surface and a dark purplish-green hue.
Prickliness: moderately thorny
Self-Cleaning Description: Most spent flowers fall off naturally, requiring little deadheading.
Self-Cleaning Intensity: Self-cleaning: good.

Flower Morphology

Petal Count: 13-25
Flower Fullness: semi double flowered
Flower Shape: cup-shaped
Flower Size: M (1,5-2,75 in)
Inflorescence Type: cluster-flowered
Colour Code: ARS code: mr RHS code: 53C (outer), 53A (inner)
Repeat Flowering: Remontant; the second flowering is also abundant.

Colour Data and Phenology

Colour: red
Flower Colour Description: Vibrant, pure cherry red with a saturated warm red shade.
Closed Bud: Deep cherry-red surface with a slight purplish darkening at the tip.
Newly Opened Flower: Intense, radiant cherry red with a slightly darker tone towards the centre.
Full Bloom: Uniform cherry red, the edges of the outer petals are paler.
Before Fading: Muted warm red with a lightening cherry‑red shade.
Colour Fading Description: Freshly cherry-red, it may gradually lighten to a pinkish hue over time and in strong sunlight.

Fragrance and Aroma

Fragrance Strength: very weak, barely perceptible scented rose
Fragrance Character: sweet fruity aroma
Pollinator Attraction: Semi-double, 13–25-petalled flowers moderately attract pollinators, as flower form (simple/semi‑double/double) and the accessibility of the stamens influence the level of attraction.
Pollinator-Friendly Rating: The semi-double (13–25 petals) flowers moderately attract pollinators, and are therefore partially pollinator-friendly.

Hip Characteristics

Hip Shape: spherical
Hip Colour: orange-red
Hip Comment: Formation of rose hips is generally sparse; occasionally it may produce spherical ornamental hips 6–10 mm in diameter, orange-red in colour.

Resistance and Hardiness

Hardiness (°C): -26–-23 °C
Heat and Drought Tolerance Description: Tolerates heat well; once established it tolerates moderate drought.
Disease Resistance: resistant
  • powdery mildew – resistant
  • black spot – resistant
  • rust – resistant

Horticultural Recommendations

Recommended product path: Project mass planting
Release form: Uniform, dense, bush-trained finished product
Recommended use: Maintenance requirement low; minimal care required.
Primary Uses: flowerbed, park, urban green space, edging, hedge, container, shrub group

Comments

Positioning: Project (landscape architecture / mass use)
Target customer/channel: Landscape contractor, project-serving wholesaler / maintenance
Main value proposition: Fast coverage – uniformity
DOUBLE KNOCK OUT® – red landscape shrub rose - Radler
Vibrant, pure cherry red with a saturated warm red shade. - landscape shrub rose - very weak, barely perceptible scented rose - sweet fruity aroma
Online rose purchase - red - very weak, barely perceptible scented rose - Double Knock Out® - landscape shrub rose - (2.8-3.8ft (85-115 cm))
Inflorescence: cluster-flowered Height: 2.8-3.8ft (85-115 cm) Flower shape: cup-shaped Winter hardiness: - red - Conard -Pyle (Star® Roses and Plants) (USA) landscape shrub rose - Flower size: M (1,5-2,75 in) Flower size: M (1,5-2,75 in) - Height: 2.8-3.8ft (85-115 cm) Height: 2.8-3.8ft (85-115 cm) - Flower fullness: semi double flowered Double Knock Out® - Roses in the garden | pharmaROSA® Neonatal - premium gold William J. Radler

We showcase the external appearance of the roses available for online purchase from our webshop.


Which product type is right for you?


PharmaRosa® NEONATAL is the cost‑effective starting point for rose product production.

As a uniform, own‑rooted propagation material, it provides a stable basis for further growing-on and can be integrated flexibly into different finished product production technologies.
Rooted in trays (rooted), 3–6‑month‑old, own‑rooted rose cutting.
Uniform developmental stage, with a root system that has thoroughly penetrated the plug.
For professional growing‑on.
Tray packaging: 10 pcs/tray.
Quality and varietal identity: production supported by a dedicated identification and traceability logic.
Can be transplanted during frost‑free periods, designed for finished product production.

PharmaRosa® NEONATAL provides a controlled, uniform starting stock for planned growing‑on that can be integrated into your own technology – especially where scheduling and varietal identity are paramount.


PharmaRosa® NEONATAL own-rooted rose propagation material in a plug, with a root system penetrating the plug (semi-finished product / semi-finished rose). PharmaRosa® NEONATAL rose propagation material size: 3–6‑month‑old, own-rooted cutting with a uniform developmental stage. PharmaRosa® NEONATAL rose propagation material root system: plug densely penetrated by well-developed white roots (root system detail). PharmaRosa® NEONATAL tray stock: own-rooted rose propagation material in trays, uniform developmental stage (10 pcs/tray).

Captions (from left to right): Semi-finished product (NEONATAL own-rooted rose propagation material in a plug with a fully developed root system) • Size demonstration (3–6‑month‑old, uniform cutting) • Root system detail (plug penetrated by the root system) • Tray stock (10 pcs/tray, uniform developmental stage)

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Which product type is right for you?

Pages for private customers
Garden roses for the family garden, with minimal care  → ORIGINAL®
Premium garden roses – instant impact, a truly showpiece garden  → EXTRA®
Pages for professionals and private customers
Roses for public spaces – large areas, sustainable maintenance  → NATURAL®
Roses for projects – hedge and row planting, fast implementation  → RAPID®
For professional partners only
Production – propagation material for garden roses, wholesale  → NEONATAL®

Company details

PharmaRosa Ltd.
Company registration number: 01-09-717479
VAT number: 13075314-2-43
Plant health registration no.: HU130721
Bank account (IBAN):
HU85117631891388688400000000
BIC (SWIFT): OTPVHUHB
Bank name: OTP Bank Nyrt.