ROSENTHAL – dark red hybrid tea rose – KORtat
Exhibition performance, premium flower form and strong fragrance make Rosenthal (KORtat) a dependable hybrid tea choice where cut-flower style, dark red blooms are central to your offer, while its dense foliage, upright growth and resistant leaf health support homogeneous, high-credibility nursery lines for retail and reseller channels. As own-root pharmaROSA® NEONATAL material, 3–6‑month tray-rooted cuttings give you a scalable propagation base for premium container production (5–7 L) and later transfer into 40–50 L specimens for thematic rose gardens and collection plantings, with winter tolerance well-suited to exposed northern and inland UK sites. Low maintenance demand and good disease resistance reduce intervention needs at scale, supporting reliable scheduling from rooting in Year 1 through structural build in Year 2 to full ornamental value by Year 3 across integrated nursery networks and public‑realm supply chains.
Usage options
Finished-product ideas
- Premium 6 L exhibition hybrid tea – Uniform 5–7 L production highlighting XL, high‑centred, very double blooms with strong fragrance; positioned as a flagship dark red hybrid tea within branded ranges – target audience/channel: retail–reseller partners seeking exclusive flower-quality lines.
- Collector’s label series unit – NEONATAL own-root stock grown into curated 5–7 L plants with full naming (Rosenthal, KORtat, Tatjana) for labelled collection benches, leveraging colour stability and exhibition profile – target audience/channel: specialist retailers and rose-focused resellers.
- 40 L specimen hybrid tea feature – Bush-trained plants potted on from 5–7 L into 40–50 L containers to build structured, upright specimens showcasing dense foliage and dark red, cut-flower style blooms – target audience/channel: landscaper-facing resellers and project nurseries.
- Fragrant patio focal hybrid tea – Compact, upright plants in premium 5–7 L pots emphasising strong classic fragrance and repeat flowering for terrace and patio installations – target audience/channel: garden centres and multi-site retailers.
- Thematic dark-red bed module – Batch-consistent, disease-resistant 5–7 L plants assembled as repeatable bed units for formal planting schemes, optimised from own-root blocks for low intervention – target audience/channel: wholesalers serving public-realm and institutional projects via resellers.
Technical cultivar profile
| Parameter |
Data |
| Name and registration |
Hybrid tea rose, registered as KORtat, marketed as Rosenthal Hybrid tea rose KORtat, with Tatjana as ARS exhibition name; positioned commercially as a dark red hybrid tea type for premium use. |
| Origin and breeding |
Bred by Reimer Kordes (W. Kordes’ Söhne, Germany) from ‘Liebeszauber’ × ‘Präsident Dr. H.C. Schroder’; introduced and registered in 1970, with ongoing use in high-quality hybrid tea assortments. |
| Growth and structural characteristics |
Upright habit reaching about 70–95 cm high and 50–70 cm wide, with dense, glossy dark green foliage and moderate prickliness, supporting bush-trained plants with 3–5 strong framework canes. |
| Flower morphology |
Very double, solitary, XL flowers with over 40 petals, high‑centred and pointed‑bud form of clear cut-rose character; poor self-cleaning so spent blooms generally require manual deadheading to maintain display quality. |
| Colour data and phenology |
Deep, velvety dark red colour; buds dark burgundy nearing black, opening ruby-red with deeper inner shading, holding uniform dark red with only slight fade in strong sun and occasional fine white streaks at petal base. |
| Fragrance and aroma |
Strong, classic rose fragrance clearly perceptible around flowering plants, oriented more to ornamental and sensory impact than pollinator value due to very double form and largely concealed stamens. |
| Hip characteristics |
Produces small numbers of ellipsoidal hips, around 10–14 mm in diameter, in orange-red tones; hips are present but generally not a dominant ornamental or production characteristic for this cultivar. |
| Resistance and winter hardiness |
Rated resistant to powdery mildew, black spot and rust, with RHS hardiness H7, Swedish zone 3 and USDA 6b; tolerates moderate heat and drought but benefits from regular watering in extended dry periods. |
| Horticultural recommendations |
Recommended for flowerbeds, cut-flower style use and specimen planting; suited to premium container production, especially 5–7 L, with low maintenance needs and generally limited intervention requirements in managed settings. |
Rosenthal Hybrid tea rose KORtat offers fragrant, exhibition-quality dark red blooms, reliable disease resistance and hardy, predictable own-root performance, making it a sound candidate for long-term premium lines where we can jointly plan volumes and timing.
