Robusta® – red park rose – KORgosa
This own-root pharmaROSA® NEONATAL material of Robusta® provides a reliable basis for professional UK shrub and park rose production where long-term hedging, public-realm plantings and collection stands are required. As a Hybrid Rugosa shrub with H7 hardiness and good tolerance of cold and wind, it aligns well with nursery supply into exposed schemes in Scotland and northern England, while its strong heat and drought capacity also supports broader national distribution. Uniform tray-rooted cuttings at 3–6 months integrate efficiently into standard-container programmes (2–3 L) for bush-trained, compact shrubs targeted at “standard finished product” retail and reseller channels. Own-root structure offers renewable growth and stable, low-intervention performance over time, helping nurseries build homogeneous blocks with limited replacement and predictable output. The development arc typically runs from root establishment in year one, stronger structural shoot formation in year two, and full ornamental and landscape impact from year three onwards, supporting dependable scheduling of flowering, colour-strong park roses across multiple seasons. Low–medium maintenance demand, self-cleaning single flowers and pollinator-friendly clusters together create durable, sustainable landscape value, while robust health and moderate disease needs help protect large-scale production and downstream planting budgets, providing a practical choice for growers serving both retail and project markets.
Usage options
Finished-product ideas
- 2–3 L Park Hedge Line – Bush-trained, own-root Robusta® in 2–3 L standard containers, marketed as a low–medium maintenance red hedge and boundary rose with good disease resistance – nursery supply for retail hedging ranges.
- Pollinator Red Shrub Block – Cluster-flowered, single blooms promoted for pollinator-friendly urban and community gardens, produced from NEONATAL stock into 2–3 L pots for quick planting – public-realm and community-project suppliers.
- Harsh-Site Landscape Unit – Robust, hardy shrubs grown from own-root cuttings into 5–10 L containers for exposed, low-care municipal schemes needing reliable colour and structure – landscape contractors and framework tenders.
- Specimen Scarlet Feature Rose – Selected, evenly structured plants stepped up from 2–3 L to 40–50 L containers for focal points in parks and show gardens, highlighting vivid scarlet colour and upright habit – wholesale to design-led projects.
- Own-Root Mother-Block Starter – Uniform NEONATAL tray material reserved for nursery stock-bed establishment, targeting long-term, authentic cutting supply backed by strong health and regeneration – professional propagation nurseries.
Technical cultivar profile
| Parameter |
Data |
| Name and registration |
Robusta® (KORgosa), shrub rose / landscape rose in the Park – shrub rose commercial group; registered 1979 with American Rose Society exhibition name Robusta and premium silver internal quality rating. |
| Origin and breeding |
Hybrid Rugosa shrub derived from unknown seedling × Rosa rugosa regeliana, bred by Reimer Kordes at W. Kordes’ Söhne, Germany; breeding year 1978, introduced and registered internationally from 1979 onwards. |
| Awards and recognition |
Holds an historic ADR award dating from 1980, later withdrawn, indicating earlier recognition for performance; currently relied on mainly for its proven robustness in practical landscape and garden use. |
| Growth and structural characteristics |
Upright, vigorous park-shrub habit, typically 160–220 cm high with 100–160 cm spread; dense, dark green glossy foliage and heavily thorned shoots create a solid, protective shrub mass suitable for hedging and structural planting. |
| Flower morphology |
Single to lightly double flowers, generally 5–12 petals, small S-sized (approx. 0.5–1.5 in), flat-faced clusters on the shoots; remontant with particularly abundant second flowering, self-cleaning spent blooms for reduced grooming. |
| Colour data and phenology |
Vivid, pure scarlet-red flowers (ARS MR; RHS 46A outer, 46B inner), buds dark crimson, opening brilliant scarlet then matt crimson with slightly darker centre; colour lightens modestly in strong sun but overall retention is moderate to good. |
| Fragrance and aroma |
Fresh, mildly fruity fragrance of restrained intensity; scent present but not dominant, supporting use close to paths and seating without overwhelming, while the open blooms provide strong visual rather than olfactory emphasis. |
| Hip characteristics |
Occasional ellipsoid orange hips are formed, typically 18–26 mm in diameter; provide modest autumn and winter interest and potential wildlife value, without significantly diverting energy from the plant’s flowering performance. |
| Resistance and winter hardiness |
Classed as resistant overall, with good resistance to powdery mildew and rust, moderate susceptibility to black spot; hardy to around –32 to –29 °C (RHS H7, Swedish Zone 5, USDA 4b), with good heat and moderate drought tolerance. |
| Horticultural recommendations |
Suited for flower beds, parks, specimen planting, hedging, urban green space and some cutting; low–medium maintenance, occasional black spot treatment advised; recommended as bush-trained in standard containers, target pot size 2–3 L. |
Robusta® (KORgosa) combines vigorous shrub structure, vivid scarlet colour and pollinator-friendly single blooms on a durable own-root base that supports predictable, low-replacement stands, making it a sound candidate to discuss for upcoming capacity and scheduling.
