Vibrant, pure cherry red with a saturated warm red shade. - landscape shrub rose - very weak, barely perceptible scented rose - sweet fruity aroma
– Vibrant cherry red blooms all season.
– Bushy, compact habit for beds and hedges.
– Exceptionally healthy, disease resistant foliage.
– Heat and moderate drought tolerant in urban sites.
– Low‑maintenance, self‑cleaning flower clusters.
– Special feature: Decorated with major A.R.T.S. and WUCOLS sustainability awards, ideal for resource‑wise plantings.
Vibrant garden scene – Natural diversity
pharmaROSA® ORIGINAL 2-litre own-root potted rose
20,90 £
Unfortunately, we are currently unable to ship to the United Kingdom; we only deliver to countries within the European Union. For more information, please contact us!
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DOUBLE KNOCK OUT® – red landscape shrub rose - Radler
DOUBLE KNOCK OUT® is an easy-going, modern shrub rose designed for impact in everyday British gardens, giving months of cherry-red colour with very little effort. This bushy, compact variety is naturally resilient, with excellent resistance to common rose diseases, so it stays looking tidy even in damp summers and breezy, exposed spots with challenging weather. The flowers are self-cleaning, so spent blooms drop away and the plant quickly sends up new clusters, keeping front gardens and small beds bright without constant deadheading. As an own-root plant it grows into a stable, long-lived structure, recovering well after pruning or harsher winters and maturing steadily in a simple rhythm of Year 1 roots, Year 2 shoots, Year 3 full ornamental value. Suitable for partial shade and containers as well as borders, it is an excellent choice if you want a reliable red rose that you can plant, water in, and let it get on with the job.
Double Knock Out® in bloom, showing its semi-double, cup-shaped flowers.
A Double Knock Out® mély cseresznyepiros zárt bimbója.
Dense, slightly glossy foliage with a dark green hue on Double Knock Out®.
Usage options
Target area
Reasoning
Front garden focal shrub
The rounded, bushy habit and continuous cherry-red flowering give a neat, eye-catching focal point by the front path or doorway with little maintenance beyond basic watering and a light annual prune, ideal for those who simply want dependable colour all season, especially beginners.
Small bed or mixed border
Its compact 85–115 cm height and spread fit well in modest beds and classic cottage-style borders, where repeat flowering keeps the scene lively without labour-intensive care, suiting gardeners who like a tidy look but have limited time, particularly homeowners.
Low-maintenance flowering hedge
Planted at around 60 cm centres, the dense foliage and regular flushes of bloom create an informal, low hedge that screens edges and boundaries while needing only occasional trimming, attractive for those wanting structure and colour without fiddly shaping, especially families.
Urban and street-facing gardens
This rose tolerates heat, reflective surfaces and moderate drought once established, while its strong disease resistance and self-cleaning flowers keep it looking fresh even when garden access is limited, ideal for busy city plots where weekend care is the norm and suits time-pressed commuters.
Large containers and patio planters
In a 40–50 litre or larger container, its bushy shape and constant bloom provide a generous splash of red on patios or balconies, with simple care based mainly on watering and feeding, making it well suited to paved spaces and compact gardens used by urban residents.
Low-care cottage-style group planting
Planted in groups of 3–5, the uniform height, cherry-red colour and good health build a classic cottage feel without complex combinations, and minimal deadheading is needed thanks to the self-cleaning habit, a reassuring choice for aesthetically minded but hesitant novices.
Tough family garden bed
Good heat and drought tolerance, strong disease resistance and a sturdy frame mean it copes well with children, pets and everyday use, maintaining colour through the season even when conditions are less than ideal, which is helpful for practical, low-effort gardeners.
Partially shaded borders or corners
Its ability to flower reliably in partial shade and perform well even in cooler, more humid parts of the garden broadens planting options, making awkward side-return beds or north-east facing spots more colourful and inviting for resourceful but busy owners.
Styling ideas
Cottage Duo – Combine with soft pink perennials and white foxgloves in a small bed for continuous colour and a relaxed front-garden feel – ideal for cottage-garden enthusiasts.
Patio Anchor – Plant singly in a 50-litre terracotta pot by the front door, underplanted with low silver foliage for a strong yet easy-care focal point – ideal for busy urban homeowners.
Cherry Hedge – Line a path with a loose hedge, interplanting with lavender for scent and contrast while keeping upkeep simple – ideal for families wanting structure and colour.
Urban Contrast – Pair with dark-leaved shrubs like Cotinus ‘Royal Purple’ in a small border for bold colour contrast that still copes with city conditions – ideal for design-conscious city gardeners.
Shaded Corner Lift – Use 3 plants in a triangle in a lightly shaded border with ferns and hostas to brighten a difficult corner – ideal for owners reclaiming awkward garden spaces.
Technical cultivar profile
Parameter
Data
Name and registration
Modern shrub rose, landscape type; registered as RADtko, marketed as Double Knock Out®, part of the Knock Out® collection, for bed and landscape plantings.
Origin and breeding
Bred by William J. Radler in the United States from ‘Bucbi’ and ‘Razzle Dazzle’ seedlings; introduced in 2004 by Conard-Pyle (Star® Roses and Plants).
Awards and recognition
Australian Gold Medal 2004, AGRS Regional Award 2018, A.R.T.S. Master Rose 2019, and UC Davis WUCOLS Blue Ribbon™ 2017 highlight reliability and landscape performance.
Growth and structural characteristics
Bushy, compact shrub 85–115 cm high and wide, with dense, slightly glossy dark purplish-green foliage and moderate prickliness, forming a rounded, well-filled garden presence.
Flower morphology
Semi-double, cup-shaped flowers with 13–25 petals in clusters, medium-sized at roughly 4–7 cm, repeating strongly with abundant second and subsequent flushes through the season.
Colour data and phenology
Vibrant cherry-red blooms, RHS 53C outer and 53A inner, opening deep and radiant then slowly lightening towards a pinkish tone; petals paler at the edge, retaining impact as they fade.
Fragrance and aroma
Very weak scent with a barely perceptible sweet, fruity note; chosen primarily for continuous colour, health and garden effect rather than for strong fragrance-driven plantings.
Hip characteristics
Usually sparse hip set; occasional small, spherical hips 6–10 mm across in orange-red tones, offering modest late-season interest without significantly affecting flowering performance.
Resistance and winter hardiness
Highly resistant to powdery mildew, black spot and rust; hardy to approximately −26 to −23 °C (RHS H7, Swedish zone 4, USDA 5b), with good heat and drought tolerance once established.
Horticultural recommendations
Suited to beds, hedges, groups and large containers; plant 60–110 cm apart depending on use, in well-drained soil, with low maintenance needs and simple annual pruning to shape.
DOUBLE KNOCK OUT® offers continuous cherry-red colour, strong disease resistance and an easy, self-cleaning habit on a durable own-root shrub, making it a dependable, low-effort choice you can select with confidence.
Detailed product attributes
Product Identification Data
Product Name:
DOUBLE KNOCK OUT® – red landscape shrub rose - Radler
Product Type:
pharmaROSA® ORIGINAL - 2-litre own-root potted rose
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'.
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)
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 Comment:
Formation of rose hips is generally sparse; occasionally it may produce spherical ornamental hips 6–10 mm in diameter, orange-red in colour.
Our product is a rose grown with pharmaROSA®’s unique cultivation technology!
2-litre, own-root, potted rose.
With a shoot system appropriate to the season.
With a root system that thoroughly permeates the growing medium.
Quality compliant with the requirements of the E.N.A. (European Nurserystock Association).
Supplied in unique packaging that prevents damage.
Can be planted during frost-free periods.
True-to-variety rose bush with a unique identifier.
The pharmaROSA® own-root potted rose is a well-rooted plant that supports reliable establishment when planted and cared for properly, so it can be planted whenever the soil is not frozen.
Crop overview: several varieties and growth stages in a short crop section.Shoot system: intensive growth of fresh basal shoots on a young plant.Root system: demonstration of a vigorous root system permeating the growing medium, by removing the pot.Balance: mature plant with root system and shoots in harmony with each other.
Information about the videos
The video series is not a “seasonal showcase”; it illustrates the essence of pharmaROSA® own-root cultivation in a tangible way: how the plant is built up, what the root system is like and how the shoot system regenerates. The recordings were therefore made at different times and with plants at various stages of development, so mixed foliage levels and differing stages of growth may appear in the videos. They are not a ‘sample’ of the batch dispatched, but a visual explanation of how the technology works. The current condition of the rose available to order — typical for the given period and similar to what you can expect to receive in the parcel — is shown in the upper part of the product page.
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.
