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Denomination: 'Radpastel'
Botanical Name: Rosa
Applicant/Holder: The Conard-Pyle Company
8 Federal Road, Suit 6
West Grove, Pennsylvania
United States of America
Breeder: William J. Radler, Greenfield, United States of America
Agent in Canada: Variety Rights Management
475 County Road 18
R.R. #2
Oxford Station, Ontario
K0G 1T0
Tel: 613-258-9015
Application Date: 2015-02-02
Application Number: 15-8519
Grant of Rights Date: 2016-11-29
Certificate Number: 5392
Grant of Rights Termination Date: 2036-11-29

Variety Description

Variety used for comparison: 'Radsunny' (Sunny Knock Out)

Summary: The outer side of the flower bud of 'Radpastel' is yellow green with orange red at the margin tip while that of 'Radsunny' is yellow green throughout. The flower of 'Radpastel' is a semi-double type with a greater number of petals than the flower of 'Radsunny', which is a single type. The flower and petal of 'Radpastel' are smaller than those of 'Radsunny'. The inner side of the petal of 'Radpastel' is yellow green developing a light red pink blush as it fades to white while that of 'Radsunny' is yellow to yellow orange fading to light yellow with age.


PLANT: shrub type, semi-upright growth habit
YOUNG SHOOT: very weak to weak intensity of anthocyanin colouration
PRICKLES: few, reddish

LEAF: medium to large, medium to dark green on upper side, no anthocyanin colouration on upper side, absent or very weak glossiness on upper side
LEAFLET: absent or very weak undulation of the margin
TERMINAL LEAFLET: medium elliptic, rounded base, acuminate apex

FLOWERING SHOOT: no flowering laterals, very few to few flowers
FLOWER BUD: medium ovate in cross-section, orange red colouration on outer side of petal tips
FLOWER: semi-double type, yellow colour group, medium density of petals, round shape when viewed from above, upper part is flattened convex when viewed from side, lower part is flattened convex when viewed from side, strong fragrance, no reflexing of petals one-by-one
SEPAL: medium degree of extensions
PETAL: small to medium sized, obcordate shape, inner side has one colour evenly distributed throughout, inner side is yellow green (RHS 4C) developing a light red pink (RHS 36C-D) blush as it fades to white (RHS 155B-C) with age, absent or very weak incisions of margin, absent or very weak reflexing of margin, weak undulation of margin; basal spot medium sized, medium yellow

OUTER STAMEN: some filaments are medium yellow and some are pink

SEED VESSEL: small at time of petal fall
HIP: pitcher-shaped in longitudinal section

Origin & Breeding History: 'Radpastel' originated from a hybrid cross conducted by the breeder in July 2002 in Greenfield, Wisconsin, USA. The hybrid cross was made between the variety 'Radquid', as the female parent, and the variety 'Radcor', as the the male parent. The final selection of 'Radpastel' was made in January 2013 based on its yellow flowers, bushy, rounded growth habit, attractive foliage and resistance to black spot, powdery mildew and rust.

Tests & Trials: The comparative trial for 'Radpastel' was conducted outdoors during the summer of 2015 at Variety Rights Management in Oxford Station, Ontario. The trial included a total of 15 plants each of the candidate and reference variety. All plants were grown in 22 cm pots spaced 45 cm apart. Observations and measurements were taken from 10 plants, or parts of plants, of each variety in early August 2015. All colour determinations were made using the 2001 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Radpastel' with reference variety 'Radsunny'

Number of petals per flower (count)

  'Radpastel' 'Radsunny'
mean 8.8 6.4
std. deviation 1.75 1.01

Flower diameter (cm)

  'Radpastel' 'Radsunny'
mean 6.2 7.2
std. deviation 0.50 0.73

Petal length (cm)

  'Radpastel' 'Radsunny'
mean 3.3 4.2
std. deviation 0.39 0.17

Petal width (cm)

  'Radpastel' 'Radsunny'
mean 2.8 3.4
std. deviation 0.25 0.21

Colour of petal (RHS)

  'Radpastel' 'Radsunny'
inner side 4C with 36C-D blush fading to 155B-C 12A to 13A fading to 12D

Click on image for larger view
Rose: 'Radpastel' (left) with reference variety 'Radsunny' (right)

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