Rose Grootendorst Supreme

Among the older rugosa hybrids, 'Grootendorst Supreme' remains one of the most unmistakable: a dark, richly colored sport of 'F. J. Grootendorst' whose tightly clustered, sharply fringed flowers suggest miniature carnations as much as roses. Its appeal lies less in perfume or breadth of individual bloom than in the extraordinary texture and abundance of its flowering, set against characterful rugosa foliage and a very prickly, useful shrub framework. For northern gardens, exposed sites, and collectors of unusual historic shrubs, it offers a combination of hardiness, repeat bloom, and visual singularity that few red Rugosas quite match. It is especially effective where a rose is wanted not as a single-flower exhibition subject, but as a structural, long-season garden shrub with old-fashioned distinction.

DESCRIPTION OF THE VARIETY

Rose variety ‘Grootendorst Supreme’ belongs to the Hybrid Rugosa class and is best understood as a historic mutation (sport) within the Grootendorst group. In general outline it keeps the essential rugosa virtues of stout growth, dense armature, wrinkled foliage, and good climatic tolerance, yet its flowers depart strikingly from the large, open, fragrant cups many gardeners associate with classic rugosas such as 'Hansa' or 'Roseraie de l’Haÿ'. Here the blooms are small, densely petalled, and serrated at the margins, creating the crisp, fimbriated look that has long caused the Grootendorst roses to be compared with carnations. Older references describe it simply as a sport of 'F. J. Grootendorst' with the same plant and foliage but deeper crimson flowers,they are more saturated in colour and more refined.

What keeps the variety relevant in modern gardens is precisely this tension between toughness and peculiarity. It is not a rose for those seeking broad hybrid-tea flowers, powerful scent, or generous hips, and in some climates it may not prove as spotless as the very best rugosa-derived shrubs. Yet for gardeners who value historic cultivars, cold resistance, hedging ability, and a flower form that reads almost like embroidered fabric, it is still a rose of real individuality. It is at its finest when allowed to behave as a broad, thorny shrub in mixed borders, along paths that can tolerate its armature, or in informal hedges where its repeat-flowering clusters can be appreciated at some distance as sheets of deep red.

FLOWERING

Flower bud:

The buds of this rose rose are rather small in size, dark red to crimson in colour, often pointed to ovoid, and usually presented in clusters rather than singly, clusters may contain five to fifteen flowers, sometimes more on strong flowering stems.

Bloom:
The flowers of 'Grootendorst Supreme' are small, usually measuring about 3 to 4 cm (roughly 1.2 to 1.6 in.) in diameter, they are double to very double. Their most distinctive feature is the petal margin: heavily serrated or fringed, so that the open cluster resembles a miniature spray of old-fashioned dianthus rather than a conventional rose truss. Colour is generally described as dark red, deep crimson, or rich crimson-red, consistently deeper and fuller in tone than the parent.

Flowering begins in early summer and, while the first flush is usually the most dramatic, repeat bloom is normal; in colder climates the later display may be intermittent, while in milder seasons and maritime districts flowering may continue from June into autumn. The cumulative effect is more important than any single bloom: on a mature shrub the plant can appear covered with dense red pompons, producing a textured, almost tapestry-like show. Similarly to other sports of the Grootendorst group, this rose has somewhat smaller blooms and more freely flowering than the original, otherwise they are simply identical in habit apart from color.

Petals:

The petal count is in the very double range, commonly around 30 to 40 petals. The petals are relatively narrow, tightly packed, and markedly cut or fimbriated along the margins, which is the visual signature of the entire Grootendorst group. Their texture appears reasonably firm for such small flowers, and the blooms usually hold their shape well enough to maintain a crisp cluster effect rather than collapsing into a loose, muddled rosette. As the bloom ages, the flower tends to loosen from a buttoned form into a frilled little pompon, but the cultivar is valued above all for truss effect and texture, not for a classical high-centered or quartered pattern.

Fragrance:
Fragrance is usually described as absent, negligible, or at most very light - this is not a perfume rose, and gardeners should not choose it for fragrance even though the Rugosa group as a whole is often associated with scent.

PLANT
The variety is classified as a Shrub Rose within the Hybrid Rugosa group. The plants of 'Grootendorst Supreme' are generally upright to broadly bushy, eventually somewhat spreading, with strong branching and a dense, prickly structure. The mature and well-established plants of this rose variety reach about 120 - 150 cm (4 - 5 ft) and reach about the same width. Such range reflects climate, age, pruning regime, and whether the plant is grown hard-pruned, as a hedge, or more freely as a shrub.

The plants of this rose are able to form a substantial, serviceable shrub rather than a dainty specimen, and that it can be used effectively in groups, hedges, or as a solitary old-fashioned bush where access around its thorny frame is not required.

Foliage:
The foliage is unmistakably rugosa in character, though its colour may differ slightly on shade, ranging from light green to richer, depending on climate and feeding, but generally has dark green colour. The leaves of 'Grootendorst Supreme' have the same rugosa appearance: compound pinnate leaves, usually with 5 to 9 leaflets, the individual leaflets elliptic to obovate, strongly veined, serrated, thick-textured, and distinctly rugose. The upper surface is characteristically wrinkled and firmer than that of many modern shrub roses, while the undersides and petioles may show pubescence or roughness in the broader rugosa manner. Such foliage is also notably weatherproof. The texture of the foliage is thick, wrinkled, leathery, glossy and creates a strong visual contrast between the crisp red flower clusters and the textured leaf mass. Even when out of flower, the shrub retains enough substance in leaf and cane to function as a landscape plant rather than becoming visually irrelevant between flushes.

Prickles:
Like other rugosa roses, the shrub is decidedly armed - the canes of this rose are very prickly; the prickles are straight in shape, vary much in size, from 3 to 10 mm long and sometimes larger. This has obvious practical consequences: it is excellent for defensive hedging and for places where a barrier shrub is useful, but less suitable beside narrow paths, children’s spaces, or maintenance-intensive mixed borders. Gloves and long sleeves are prudent whenever pruning or tying in growth.

Disease resistance:

Although some critics note that 'Grootendorst Supreme' and 'F. J. Grootendorst' are susceptible to black spot, and that Grootendorst group are generally less disease resistant than the best members of the Rugosa class, by the present standard those roses are still considered to have a good resistance to common rose diseases. This variety inherited thick leaves, tolerance of difficult soils, salt, wind, and drought, and reduced susceptibility to many foliar diseases when grown in full sun with good air circulation. That is why 'Grootendorst Supreme' has long been recommended for hedges, exposed gardens, and cold regions. It should also be considered strongly winter hardy by ordinary shrub-rose standards.

Its cold hardiness is exceptional as well, it can withstand temperatures as low as -37°C (-35°F), making it suitable in climates that are similar to USDA zones 2. Additionally, it is noted for its heat- and cold-resilient nature, making it adaptable to Mediterranean climates provided it has adequate moisture.

The accepted cultivar name is 'Grootendorst Supreme', while the synonym is ‘F. J. Grootendorst Supreme’. The longer form makes the relationship to 'F. J. Grootendorst' explicit, identifying the rose as the darker “Supreme” form within that line rather than as an unrelated cultivar merely carrying the family surname. Precise naming documentation from the breeder was never published.

Grootendorst

ORIGIN OF THE VARIETY

The rose variety 'Grootendorst Supreme' is a somatic mutation (sport) of its progenitor, rose variety 'F. J. Grootendorst'. It was discovered in 1936 by company F. J. Grootendorst & Sons in their nursery in the Netherlands, it was later introduced into the global market. Some later trade lists print 1938 rather than 1936, so it is possible that discovery and wider catalog distribution did not coincide exactly; nevertheless, 1936 is the date most consistently attached to the cultivar in accessible modern records.

BACKGROUND OF THE VARIETY

Within that family, 'Grootendorst Supreme' occupies the place of the dark red, richly colored form. It is commonly described as identical or nearly identical to the original in general shrub character, but with a noticeably deeper crimson bloom. This makes it, for many collectors, the most dramatic of the colored forms, especially when planted where the dark flower clusters can contrast with pale stone, silver foliage, or open lawn.

SUMMARY OF THE VARIETY

'Grootendorst Supreme' is a historic Hybrid Rugosa valued less for perfume or grand individual flowers than for its singular combination of dark crimson color, double structure, serrated petal edges, and shrub toughness. It remains one of the clearest examples of the old Grootendorst type: a rose that can function as hedge, collector’s shrub, or distinctive landscape plant, and that rewards gardeners who appreciate texture and massed effect over classical exhibition form. This rose variety incorporated the following unique combination of characteristics:

 small, very double, deeply fringed blooms with a carnation-like effect;

 a distinctly darker crimson-red color than 'F. J. Grootendorst';

 cluster flowering with recurrent bloom through the season;

 strong rugosa foliage and a very thorny, useful shrub habit;

 good hardiness and utility for hedges, groups, and exposed plantings.

COMPARISON WITH PARENTS

Compared with the source cultivar 'F. J. Grootendorst', 'Grootendorst Supreme' is distinguished above all by flower color: the blooms are consistently described as deeper crimson, darker red, or richer in tone. Also it might bloom more freely on a somewhat smaller plant, though modern accounts of vigor are mixed and should not be overstated.

USDA 2