Rose Cool Water

Graceful, large lavender or mauve colored flowers of the classical for Hybrid Tea roses high-centered shape appear on very long and strong stems. ‘Cool Water’ is known for its flowers last for a very long time both as a cut flower and on a plant. It might be not an ideal option for colder and moist climates, but has very good resistance to heat.

DESCRIPTION OF THE NEW VARIETY
Since this is variety primarily purposed for growing in a greenhouse, in the open garden conditions the phenotype may vary significantly with variations in environment such as temperature and light without, however, any variance in genotype.

In the following description, color references are made to The Royal Horticultural Society Colour Chart, 2001 Edition, except where general terms of ordinary dictionary significance are used.

FLOWER
This variety is mainly bred for production of cut flowers therefore it has ability to produce flowers year-round under greenhouse conditions. In the garden blooms in flushes from summer until frosts.

In one year, ‘Cool Water’ is able to produce about 160 flowering stems per square meter of planted plants in a greenhouse.

Flower bud:
The flower buds are large, ovoid. When the sepals start to divide have length of about 4 to 5 cm (about 1.6 to 2 inches) and the diameter is about 3 to 4 cm (1.2 to 1.6 inches). The colour of the petals when the buds just start to open is medium purple red (Group 54A). They appear on the plant mostly singly or in a small cluster of 3 to 5 flower buds.

The sepals have an average length of about 2.5 cm (about 1 inch) and the width is about 1.2 cm (about 0.5 inches). The shape of the petals is lanceolate, the base shape is cuneate, and the apex is apiculate; the margin is entire; the texture of the upper and of the lower surface is pubescent. The colour of the upper surface of the sepals is light green (Group 145A) and slightly lighter shade of light green (Group 145C) on the lower side. There are 3 normally appendaged sepals and 2 unappendaged sepals with smooth edges.

The peduncles are very strong and erect, having glabrous texture and medium green (Group 144A). The length of the peduncles is about 9 to 10 cm (3.5 to 4 inches) and the diameter is about 6 to 7 mm (0.24 to 0.28 inches).

Bloom:
The flowers are large, the diameter of the open flower is about 9.5 - 11 cm (3 to 4.5 inches), and the depth (height) is about 5 to 6 cm (about 2 to 2.4 inches). They are full, high-centered, the flower form persists unchanged until the flower fades, almost never showing the center.

The general tonality of the flowers is mauve / lavender. The flowers have very good longevity on plant – about 3 weeks and as well good longevity as a cut flower – about 10 12 days.

Petals:
The average number of petals on a flower is about 40 and they are arranged in numerous whorls. The length of the petals is about 4.2 to 6 cm (1.7 to 2.4 inches) and the width is about 5.3 to 7.5 cm (2.1 to 3 inches). The shape is obovate, the apex is rounded, entire margin and smooth, satiny texture.

Upon the opening, the upper surface of the petals have light violet colour (Group 75B) which fades on the base to light yellow (Group 2D). When the flower starts to open the colour of the lower surface is light violet (Group 75C) with light yellow colour of the base (Group 2D).

The very outer petals have green white colour with darker light green base colour and light white-green edges, often also with magenta-pink colour on the very end of the petals. This coloring of the outer petals usually persists, only becoming more dull as the flower ages.

Fully opened flower on the upper surface is dark blue pink (Group 70C) and light yellow colour (Group 2D) of the base. As the flowers develops further the colour becomes lighter, closer to light violet (Group 75A). The fully opened flower has medium violet colour (Group 72D) of the lower surface with light yellow colour of the base (Group 2D).

Petaloids are not observed on the flowers.

The petals dry out and hang on the plant.

Fragrance:
The fragrance of ‘Coll Water” is slight, typical florists rose fragrance.

Reproductive parts:
The quantity of the stamens per flower is about 100.

The anthers length is about 4 mm (0.16 inches), have elliptic shape and light yellow colour (Group 4D).

Filament has light yellow colour (Group 4D).

The quantity of pistils per flower is about 150, the length is about 6 mm (0.24 inches).

Stigma has elliptic shape and dark orange colour (Group 28B).

Style length is about 5 mm (0.2 inches) and light yellow colour (Group 4D).

Receptacle is medium green (Group 144A), has height is about 1.3 to 1.5 cm (0.5 to 0.6 inches) and the diameter is about 1.7 to 1.9 cm (0.67 to 0.75 inches).

Seed and fruit development has not been observed.

PLANT
The rose is classified as Rosa hybrida cultivar, Hybrid Tea rose cultivar used for production of the cut flowers.

Forms upright plant with vigorous growth habit. The mature plant height is about 100 to 110 cm, and the width is about 50 – 100 cm.

Foliage:
The foliage has alternate arrangement, compound with about 3 to 7 leaflets. On the normal flowering stem there are about 15 compound leaves. The leaf has a length of about 15 to 20 cm (5.9 to 7.9 inches) and a width of about 12 to 15 cm (about 4.7 to 5.9 inches).

Leaf petiole is about 2 to 3 cm (2 to 2.4 inches) long and about 2 mm (0.08 inches) in diameter.

The stipules have length of about 2 cm (0.8 inches) and about 1 cm (0.4 inches) in diameter. They have roughly lanceolate shape, with cuneate base and cleft apex. The texture on the upper and lower surfaces is glabrous and leathery.

The general appearance of the developing and fully expanded foliage on the upper surface has slightly darker than dark brown green colour (Group 147A) and on the lower surface is dark brown green colour (Group 147B).

Leaflets:
The terminal leaflet has a length of about 9 to 11 cm 9 to 11 cm (about 3.5 to 4.3 inches) and the width of about 6 to 8 cm (about 2.4 to 3.1 inches). The lateral leaflet is about 6 to 8 cm (about 2.4 to 3.1 inches) long and about 5 to cm (2 to 2.4 inches) wide. Their shape is ovate to oval, the apex is rounded and the base is obtuse, margins are serrated. The texture of the leaflet on the upper and lower surfaces is glabrous and leathery, the venation pattern is pinnate.

Leaflet petiole length is about 1 to 2 cm (0.4 to 0.8 inches) and the diameter is about 1 to 2 mm (0.04 to 0.08 inches).

The colour of the leaflets and of the leaflet petioles on the upper and lower surfaces is dark brown green (Group 146B). The stipule on the upper surface has dark brown green colour (Group 137B) and the colour of the lower surface is light green (Group 144B). The venation on the upper surface is medium grey green (Group 195A) and medium brown green (Group 146D) on the lower surface.

Stems:
The quantity of the flowering stems is about 10 to 12 per plant. They are straight, upright and are very strong. The length of the normal flowering stem is about 80 to 90 cm (31.5 to 35.4 inches) and the diameter is about 2 cm (0.8 inches), the internode length is about 4 to 8 cm (1.6 to 3.1 inches).

The flowering stems have medium brown green colour (Group 146A) and glabrous texture.

Prickles:
The quantity of prickles is about 1 per 1 cm of the stem’s length. They have height of about 7 to 8 mm (0.28 to 0.31 inches) and diameter at a base from 7 to 10 mm (0.28 to 0.39 inches). The shape is triangular and the colour is medium brown (Group 174A).

Small prickles:
The small prickles are not observed on this variety.

Disease resistance:
The variety ‘Cool Water’ have not been observed to be resistant to pathogens and pests common to roses. When grown in a garden have medium resistance to black spots and mildew, the resistance to botrytis is good.

Unfortunately we do not have information about the origin of the name of this rose.

ORIGIN OF THE VARIETY
‘Cool Water’ originated from a crosspollination made by Petrus Nicolaas Johannes Schreurs in 1999 by crossing two unnamed roses - proprietary selections, both not patented. The cultivar ‘Scholtec’ / ‘Cool Water’ was discovered and selected as a flowering plant within the progeny of the stated cross in a controlled environment in De Kwakel, The Netherlands. ‘Scholtec’ / ‘Cool Water’ differs primarily from plants of the unnamed proprietary selections in flower color.

Parentage:

Female, or seed parent - unnamed proprietary selection of Rosa hybrida, not patented.

Male, or pollen parent - unnamed proprietary selection of Rosa hybrida, not patented.

BACKGROUND OF THE VARIETY
Scholtec.

‘Scholtec’ / ‘Cool Water’ is a product of a planned breeding program in De Kwakel, The Netherlands. The objective of the breeding program was to develop new cut Rose cultivars with a high yield of cut flowering stems, attractive flower color, long and strong stems, dark green leaves and good postproduction longevity.

Asexual reproduction of the new cultivar by cuttings taken at De Kwakel, The Netherlands, since 2000, has shown that the unique features of the new cultivar are stable and reproduced true to type in successive generations of asexual reproduction.

SUMMARY OF THE VARIETY
The following traits have been repeatedly observed and are determined to be the unique characteristics of ‘Scholtec’ / ‘Cool Water’. These characteristics in combination distinguish this rose from other known varieties:

• Dark green-colored leaves.
• Vigorous growth habit.
• Long and strong flowering stems.
• Large mauve-colored flowers.
• High yield of cut flowering stems
• Good postproduction longevity.

COMPARISON WITH THE CLOSEST COMMERCIALLY AVAILABLE CULTIVAR
Plants of the ‘Scholtec’ / ‘Cool Water’ can be compared to plants of the cultivar ‘Schrenat’ / ‘Aqua!’. In side-by-side comparisons conducted in De Kwakel, The Netherlands, plants of the new Hybrid Tea Rose differed from plants of the cultivar ‘Schrenat’ / ‘Aqua!’ in the following characteristics:

• Plants of the ‘Scholtec’ / ‘Cool Water’ were taller and broader than plants of the cultivar ‘Schrenat’ / ‘Aqua!’.
• Flowers of plants of the ‘Scholtec’ / ‘Cool Water’ were mauve in color whereas flowers of plants of the cultivar ‘Schrenat’ / ‘Aqua!’ were pink in color.

USDA zone 6 and warmer