The petals are a uniform snow-white shade with a delicate silky sheen. - landscape shrub rose - very faint, barely perceptible scented rose - fresh character
– Pure snow-white flowers with lasting colour
– Compact, bushy habit for beds and borders
– Low-maintenance rose needing minimal pruning
– Excellent disease resistance in most gardens
– Proven heat and drought tolerance Gné speisialta: Awarded A.R.T.S.® Master Rose for all-round garden performance.
Sophisticated flower colours – Natural plant form
pharmaROSA® ORIGINAL 2-litre own-root potted rose
19,40 €
3.5(5094)
WHITE KNOCK OUT® – white landscape shrub rose – RADwhite
The WHITE KNOCK OUT® shrub rose gives You uncomplicated, dependable colour in modern family gardens: snow-white, self-cleaning flowers on a compact, bushy shape that keeps beds looking tidy with almost no deadheading. Bred for strong health, it shrugs off common rose diseases even in damp Irish summers and copes well where heavy soils need good drainage after rain. Its excellent heat and moderate drought tolerance mean less watering stress on busy weeks, while the low-maintenance pruning needs make seasonal care straightforward for beginners. As an own-root plant, it matures into a long-lived, resilient bush that can regenerate from its own base. Think in terms of steady progress: the first year it quietly builds roots, the second year the framework and shoots fill out, and by the third season You enjoy its full ornamental value with a dense, flower-covered outline.
White Knock Out® flowers soften to creamy white with a faint pale green edge.
White Knock Out® with flat, single white flowers in clusters.
Closed bud of White Knock Out® with a creamy white base and pale green tip.
Use cases
Target area
Reason
Front garden focal shrub near the entrance
Compact, well-branched growth to 90–120 cm makes a neat, rounded shrub that frames paths and doorways without outgrowing a small front garden, giving reliable summer colour with minimal pruning for the busy homeowner
Low-maintenance flowering hedge along a boundary
Dense foliage and repeat-flowering clusters create a softly structured, low hedge at about 1 m high, ideal for edging driveways or separating spaces where You want privacy and flowers but don’t want high-maintenance clipping and feeding, suiting the relaxed gardener profile
Mixed border with perennials in family gardens
Its natural, bushy shape and mid-height habit blend well with cottage-style perennials such as coneflowers or grasses, adding pure white contrast all summer without complex care routines, perfect for informal family borders managed by a casual gardener
Urban front gardens with challenging conditions
Proven urban tolerance and low water needs make it ideal beside pavements and driveways where reflected heat and limited soil moisture can be issues, yet it still flowers steadily with basic watering, supporting time-poor city-dwelling gardeners
Coastal and windswept suburban sites
Robust shrub structure and strong disease resistance mean the plant copes well where moist winds and air-borne salt can trouble fussier roses, provided the soil offers reasonable drainage after heavy rain, reassuring exposed-site owners
Containers on patios, balconies and terraces
Its compact, rounded habit suits large tubs of at least 40–50 litres, where the dark foliage and white blooms give a clean, modern look; with regular watering it stays tidy and self-cleaning, a convenient choice for low-effort balcony and patio users
Easy-care beds around new-build family homes
Low maintenance, minimal feeding needs and excellent disease resistance make it an ideal “plant and enjoy” rose for new gardens, giving reliable colour while the rest of the landscaping settles in, ideal for first-time owners
Long-term planting for durable beds and borders
As an own-root modern shrub, it builds a stable framework over the years and can regenerate from its base if cut back, ensuring long-lived ornamental value with simple care for forward-planning garden planners
Decorating ideas
White cottage ribbon – Plant a loose ribbon of WHITE KNOCK OUT® along a path with clumps of blue catmint and pink coneflowers for a soft cottage-garden look – ideal for lovers of relaxed, romantic front gardens
Clean modern contrast – Combine it with dark-leaved heucheras and slate-grey pots for a crisp white-and-charcoal palette that suits contemporary townhouses – for design-conscious urban homeowners
Low border glow – Line the front of a mixed border with these shrubs, backed by taller hydrangeas, to create a glowing white edge that reflects evening light – for families who enjoy summer evenings outdoors
Coastal calm – Pair WHITE KNOCK OUT® with ornamental grasses such as Carex ‘Blue Zinger’ and hardy lavender in well-drained soil for a breezy seaside feel – for cottage and coastal-garden enthusiasts
Patio centrepiece – Grow a single shrub in a 50-litre terracotta pot with trailing thyme around the rim to create a long-flowering, easy-care feature – for busy gardeners wanting effortless patio impact
Technical cultivar profile
Characteristic
Data
Name and registration
Modern shrub rose registered as RADwhite, traded as WHITE KNOCK OUT®, KNOCK OUT® and White Out. Belongs to the Knock Out collection, used mainly as a landscape shrub and bed rose.
Origin and breeding
Bred by William J. Radler in the United States from ‘RADmom’ × ‘RADsweet’. Introduced in 2009 via Star Roses and Plants in the USA and Meilland International in Europe, with plant patent protection.
Awards and recognitions
Gold Medal at Rose Hills International Rose Trials 2011, Merit Certificate at Bagatelle (Paris) 2017, WUCOLS Blue Ribbon 2017–2019 for water-saving performance, A.R.T.S. Master Rose designation in 2021.
Growth and structure
Compact, bushy shrub reaching 90–120 cm in height and spread, with dense, matt, very dark green foliage. Moderately thorny stems and a naturally rounded outline suit hedging, edging and low landscape planting.
Flower morphology
Single, flat blooms with 5–12 petals, medium-sized at roughly 4–7 cm. Produced in clusters with very good repeat flowering, as spent blooms mostly drop cleanly by themselves, reducing deadheading work.
Colour and phenology
Flowers open pure, snow white with a soft pearly sheen, buds creamy white with pale green tips. Colour is stable and long-lasting, fading only slightly to creamy white over time, giving a consistently fresh appearance.
Fragrance and aroma
Fragrance is very faint, with a fresh, light character rather than a strong perfume. Single flowers offer limited pollinator attraction due to their form and stamen accessibility, but still provide some seasonal interest.
Rose hip characteristics
Occasional small hips, about 5–7 mm, spherical and orange-red when mature. They can add a subtle decorative effect in late season but are not a dominant ornamental feature of this variety.
Resistance and hardiness
Excellent resistance to powdery mildew, black spot and rust, rated resistant in trials. Hardy to approximately −32 to −29 °C (USDA 4b, RHS H7, Swedish zone 5), with good tolerance of heat and moderate drought once established.
Horticultural recommendations
Suited to beds, borders, low hedges, specimen use and urban landscapes. Plant 65–75 cm apart for massing, up to 120 cm as a specimen. Prefers well-drained soil and benefits from basic watering during prolonged dry spells.
WHITE KNOCK OUT® offers compact, tidy growth, self-cleaning white flowers and strong disease resistance, while its own-root form supports long-lived, dependable shrubs for effortless family gardens, making it a reassuring choice if You prefer uncomplicated planting.
Detailed product attributes
Product Identification Data
Product Name:
WHITE KNOCK OUT® – white landscape shrub rose - Radler
Product Type:
pharmaROSA® ORIGINAL - 2-litre own-root potted rose
Cultivar Name Meaning:
The name refers to the white-flowered member of the "Knock Out" series; "Knock Out" denotes a knockout or victory and "White" indicates the white colour.
Synonym Name:
White Out™; Knock Out White®; Rosa ‘White Out’
Competition and Show Awards:
Rose Hills International Rose Trials – Gold Medal (2011); Bagatelle (Paris) – Merit Certificate (2017); WUCOLS Blue Ribbon™ (outstanding water-conservation performance) (2017–2019); A.R.T.S.® Master Rose designation (2021)
Pollinator Attraction:
Its simple (single), 5–12-petalled flowers attract pollinators only to a limited extent, as the single flower form and relatively inaccessible stamens reduce their attractiveness.
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.
