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Denomination: 'Radcor'
Trade name: Rainbow Knock Out
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: 2006-12-21
Application Number: 06-5699
Grant of Rights Date: 2009-02-10
Certificate Number: 3444
Grant of Rights Termination Date: 2027-02-10

Variety Description

Variety used for comparison: 'Morden Sunrise'

Summary: 'Radcor' has stronger anthocyanin colouration of the shoots than 'Morden Sunrise'. 'Radcor' has a smaller darker green leaf than 'Morden Sunrise'. The flower pedicel of 'Radcor' has more hairs or prickles than 'Morden Sunrise'. 'Radcor' has stronger sepal extensions than 'Morden Sunrise'. The flower diameter of 'Radcor' is smaller than 'Morden Sunrise'. 'Radcor' has fewer flower petals than 'Morden Sunrise'. The flower petal of 'Radcor' is orange red to purple red colour while it is orange red to orange pink in 'Morden Sunrise'. 'Radcor' has a smaller flower petal than 'Morden Sunrise'. The flower petal margin of 'Radcor' has stronger reflexing and undulation than 'Morden Sunrise'. 'Radcor' has prickles on the receptacle while 'Morden Sunrise' does not. The flower fragrance of 'Radcor' is weaker than 'Morden Sunrise'.


PLANT: small landscape shrub rose, upright to bushy growth habit
YOUNG SHOOT: weak anthocyanin colouration, reddish brown hue
PRICKLES/THORNS: linear to concave shape, sparse short and long ones, greenish brown to reddish brown colour

ENTIRE LEAF: dark green, medium glossiness, 3-7 leaflets
TERMINAL LEAFLET: serrate to dentate margin, leathery, rounded base

FLOWERING SHOOT: medium number of flowers per shoot, medium number of hairs/prickles on pedicel, begins flowering midseason for almost continuous period of more than 10 weeks
FLOWER BUD: pointed to ovoid in shape, red colour when quarter opened
SEPAL: weak to medium extensions
FLOWER: round shape when viewed from above, upper side flat when viewed from the side, lower side flattened convex when viewed from the side, centre normal to open, single type, purple red
PETAL: inner surface orange red/purple red to purple red, outer surface orange red/light pink red to light blue pink, small yellow inner and outer petal spot, medium reflexing of margin, medium to strong undulation of margin
REPRODUCTIVE ORGANS: yellow filament, medium length red style when flower not opened, weak hairiness of upper half of style, stigma positioned below anthers, medium sized pitcher shaped receptacle, prickles present on receptacle

FRAGRANCE: weak tea/spicy

DISEASE RESISTANCE: moderately resistant to mildew, resistant to black spot

Origin & Breeding History: 'Radcor' was selected from a seedling population produced by a controlled pollination conducted in Greenfield, Wisconsin, USA in 1998. 'Midgefree Picottee' was used as the female parent and 'Lots of Coral' was used as the male parent. The variety was selected in 2002 based on flower colour, long blooming season and shrub rose habit.

Tests & Trials: Trials were conducted during the summer of 2007 in Oxford Station, Ontario. Fifteen plants of each variety were individually grown in 25 cm pots in a poly house. Plants were spaced 45 cm apart.

Comparison tables for 'Radcor' with reference variety 'Morden Sunrise'

Flower diameter (mm)

  'Radcor' 'Morden Sunrise'
mean 50.11 69.67
std. deviation 5.30 4.90

Petal colour (RHS)

  'Radcor' 'Morden Sunrise'
middle zone outside 39B/C 21D
middle zone inside 39B/54C 35B/31B/C
margin outside 55C/54D 38C
margin inside 55B 37A/B

Flower petal length (mm)

  'Radcor' 'Morden Sunrise'
mean 26.57 36.14
std. deviation 1.27 1.35

Flower petal width (mm)

  'Radcor' 'Morden Sunrise'
mean 18.71 38.04
std. deviation 1.38 2.16

Click on image for larger view
Rose: 'Radcor' (left) with reference variety 'Morden Sunrise' (right)

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