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 flowers all season
– Excellent disease resistance in tough sites
– Low‑maintenance, self‑cleaning shrub habit
– Thrives in heat and moderate drought
– Ideal for hedges, beds and urban plantings Special feature: Multi‑award winning A.R.T.S. Master Rose for reliable landscape performance.
Vibrant garden scene – Natural diversity
pharmaROSA® ORIGINAL 2-litre own-root potted rose
23,30 €
3(4976)
DOUBLE KNOCK OUT® – red landscape shrub rose – RADtko
If You want a rose that simply works in everyday Irish conditions, Double Knock Out® gives You generous cherry-red flowers on a compact, bushy shrub that shrugs off rain and wind and copes well with heavy soil as long as drainage is improved. It flowers repeatedly from early summer to autumn, the clusters refreshing themselves thanks to its naturally self-cleaning habit, so You spend more time enjoying and less time deadheading. Its foliage is remarkably healthy, with reliable resistance to common fungal diseases that often trouble roses in our humid climate, supporting a long, low-maintenance life in the garden. As an own-root plant it grows into a stable, well-shaped shrub that recovers more easily from pruning or winter damage, keeping its ornamental value over many years. Semi-double blooms with a lightly open centre offer moderate interest for pollinators while still providing that full, romantic colour effect from a distance. Ideal for busy households, it is equally at home in front gardens, small beds or large containers, settling in reliably if You provide regular watering in the first season. Think of it as a friendly, forgiving partner in Your planting plans – roots in year one, fuller shrub in year two, and a truly completed garden look by year three, giving You confidence even if You are a complete beginner. Its award-winning performance in demanding urban landscapes translates directly into dependable garden ease for You.
Semi-double, cup-shaped blooms of Double Knock Out®.
Closed bud of Double Knock Out® in deep cherry red.
Dense, glossy foliage with a dark purplish-green shade.
Use cases
Target area
Reason
Front garden focal shrub
The compact, bushy habit and continuous cherry-red flowering make it perfect beside a driveway or front path, providing a tidy, welcoming look without complicated pruning or feeding routines, ideal for a time-poor homeowner
Low-maintenance bed in family garden
With excellent disease resistance and good self-cleaning, it keeps beds looking fresh with minimal deadheading, so You can enjoy months of colour even in wet summers without constantly treating or fussing over the plants, suiting the relaxed gardener
Small hedge or boundary line
Planted 60 cm apart, it forms a dense, flowering, shoulder-height line that clearly defines paths or garden boundaries while staying easy to trim back once a year, perfect for those wanting soft structure rather than high-maintenance formality, appealing to the practical planner
Mixed cottage-style border
Its vibrant red clusters stand out among perennials and shrubs such as lavender or catmint, and the semi-double flowers add a gentle, pollinator-friendly element without dominating the planting, making it attractive for fans of informal, romantic borders
Urban and roadside planting
Bred and proven for demanding landscape use, it tolerates heat, reflected light and lower upkeep, keeping its good leaf cover and flower show in public-facing spots where regular care is limited, a reassuring choice for shared frontages and communal spaces
Coastal or exposed Irish sites
Its sturdy framework and reliable health cope well where wind and driving rain meet heavier soils, as long as drainage is improved, providing colour where many plants struggle, which suits coastal villagers and exposed-estate gardens
Large container on patio or balcony
In a 40–50 litre pot with quality compost, it builds a compact, floriferous shrub that decorates seating areas from early summer onwards, allowing You to enjoy real garden impact even in paved spaces, ideal for apartment or townhouse dwellers
Small rose group for strong colour impact
Planting 3–5 together at recommended spacing quickly creates a bold, long-season block of red that looks designed yet easygoing, maturing from simple young plants to a full, coherent display over the first three years, rewarding the patient beginner
Decorating ideas
Cherry-Red Welcome – Line the front path with a short Double Knock Out® hedge underplanted with white alyssum for a bright, low-care entrance – perfect for busy families
Country Cottage Mix – Combine with lavender and foxgloves in a loose border so the red blooms pop among soft purples and spires – ideal for cottage-garden lovers
Patio Feature Pot – Plant one shrub in a 40–50 litre terracotta container and circle the rim with trailing thyme for scent and texture – great for balcony and terrace users
Urban Colour Block – Group three shrubs with dark-leaved heucheras and ornamental grasses to create a modern, low-maintenance city planting – suited to contemporary homeowners
Family-Friendly Corner – Place Double Knock Out® with a small hydrangea and spring bulbs to give layered interest without complicated care – ideal for beginner gardeners
Technical cultivar profile
Parameter
Data
Name and registration
Modern Shrub (Landscape Shrub) rose, registered as RADtko, marketed as Double Knock Out® within the Knock Out® collection; ARS exhibition name Double Knock Out®, commercial bed and landscape shrub type.
Origin and breeding
Bred in the United States by William J. Radler from ‘Bucbi’ × ‘Razzle Dazzle’ seedlings; introduced 2004 by Conard-Pyle (Star Roses and Plants), CP Delaware Inc, with US plant patent granted in 2006.
Awards and recognitions
Winner of Australian Gold Medal 2004; American Garden Rose Selections Regional Award 2018; A.R.T.S. Master Rose 2019; UC Davis WUCOLS Blue Ribbon 2017, confirming strong performance and reliability in trials.
Growth and structure
Forms a bushy, rounded shrub 85–115 cm high and wide, with dense, slightly glossy dark purplish-green foliage and moderate prickles, creating a full, landscape-suitable plant that reads as a compact flowering mound.
Flower morphology
Semi-double to lightly full flowers with 13–25 petals, cup-shaped and cluster-flowered; medium size at roughly 4–7 cm, produced continuously in flushes, with most spent blooms dropping cleanly to maintain a neat appearance.
Colour and phenology
Vibrant, pure cherry-red blooms, deeper towards the centre, opening from deep cherry buds; colour may lighten towards pinkish red in strong sun, yet overall effect remains a warm, clear red through the main flowering period.
Fragrance and aroma
Fragrance is very weak, with only a barely perceptible sweet fruity note on close inspection; chosen primarily for ornamental colour, flower production and health rather than for strong scent in the garden.
Rose hip characteristics
Usually sparse hip set; occasionally forms small, spherical hips about 6–10 mm in diameter, orange-red in colour, which can add light ornamental interest in late season without creating heavy seeding.
Resistance and hardiness
High resistance to black spot, powdery mildew and rust; hardy to around −23 to −26 °C (RHS H7, Swedish Zone 4, USDA 5b), tolerating heat and moderate drought once established, suitable for robust, low-input plantings.
Horticultural recommendations
Best in fertile, well-drained soil with sun or light partial shade; space 60–110 cm depending on hedge or specimen use; water well in year one, then maintain with simple annual pruning, feeding and mulching in spring for sustained performance.
DOUBLE KNOCK OUT® offers months of vivid red colour, healthy, low-maintenance growth and the long-term stability of an own-root shrub, making it a dependable choice for an easy, rewarding garden that 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
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.
Rose Hip Notes:
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 unique pharmaROSA® cultivation technology!
2 litre, own-root, potted rose.
With shoots appropriate to the season.
With roots thoroughly interwoven through the growing medium.
Quality in line with the requirements of the E.N.A. (European Nurserystock Association).
In unique packaging that prevents damage.
Can be planted during frost-free periods.
True-to-type rose plant with an individual 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.
Stock: several varieties and several stages of development in a short stock section.Shoot system: intensive growth of fresh basal shoots on a young plant.Root system: presentation of the strong root system interwoven through the growing medium with the pot removed.Balance: mature plant where the development of the root system and the shoots is in harmony.
Information about the videos
The video series is not a “seasonal showcase”, but makes the essence of pharmaROSA® own-root production tangible: how the plant is built, what the root system is like and how the shoots renew themselves. The footage was therefore taken at different times, showing plants at different stages of development, so mixed leaf coverage or differing growth stages may appear in the videos. This is not a “sample” of the batch delivered, but an illustration of how the technology works. The current condition of the rose available to order — typical of the given period and similar to what you can expect to receive in the parcel — is shown at the top 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.
