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Denomination: 'CA28'
Botanical Name: Rosa
Applicant/Holder: Agriculture & Agri-Food Canada, Lacombe
Lacombe Research Station
6000 C and E trail
Lacombe, Alberta
T4L 1W1
Breeder: Claude Richer, Agriculture & Agri-Food Canada, Saint-Jean-sur-Richelieu, Quebec
Agent in Canada: Canadian Nursery Landscape Association
7856 Fifth Line South, R.R. 4
Milton, Ontario
L9T 2X8
Tel: 888-446-3499
Application Date: 2012-07-20
Application Number: 12-7685
Date Withdrawn: 2014-07-28

Variety Description

Variety used for comparison: 'Morden Centennial'

Summary: 'CA28' has an upright growth habit whereas 'Morden Centennial' has a moderately spreading growth habit. The plants of 'CA28' are shorter than those of 'Morden Centennial'. The intensity of anthocyanin colouration on the young shoots of 'CA28' is strong whereas it is weak on 'Morden Centennial'. 'CA28' has more petals per flower than 'Morden Centennial'. The petals of 'CA28' are blue pink to light blue pink whereas they are purple red on 'Morden Centennial'. 'CA28' has a strong fragrance whereas 'Morden Centennial' has a very weak fragrance.


PLANT: shrub type, upright growth habit
PRICKLES/THORNS: few, reddish
LEAF: medium size, medium green on upper side, anthocyanin colouration absent, weak glossiness on upper side, absent or very weak undulation of margin
TERMINAL LEAFLET: medium elliptic shape, rounded base, acute apex

FLOWERING SHOOT: very few flowering laterals, very few flowers per flowering lateral
FLOWER BUD: medium ovate shape in longitudinal section
FLOWER: double type, pink blend colour group, pink centre, dense petal density, irregularly rounded shape when viewed from above, convex profile on upper part, concave profile on lower part, strong fragrance, weak sepal extensions
PETAL: reflexing present, transverse elliptic shape, absent or very weak incisions, strong reflexing of margins, medium undulation of the margin, large size, two colours, main colour on inner and outer sides blue pink to light blue pink (RHS 62A, B, C), secondary colour white (RHS 155D) at base
BASAL PETAL SPOT: medium size, greenish on inner side
OUTER STAMEN: predominantly light yellow filament

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

Origin & Breeding History: 'CA28' arose from the cross 'Secret' by 'Astrid Lindgren' conducted at the Agriculture and Agri-Food Canada St-Jean-sur-Richelieu Research Station, St-Jean-sur-Richelieu, Quebec in 2003. Fruit were harvested in 2003 and the resulting seed was planted in the winter/spring of 2004. The selection was first planted in the field in 2004, was re-propagated and planted for more thorough assessment from 2006 onward. Selection criteria included hardiness, disease tolerance, flower colour and fragrance.

Tests & Trials: Trials for 'CA28' were conducted in plots at the Prairie Shade Nursery, Portage la Prairie, Manitoba during the summer of 2011. The trial included a total of 6 plants each of the candidate and reference varieties spaced 2 metres apart between rows and 0.6 metres apart in rows. All plants were grown from 2 year old plants previously grown in 2 gallon pots. Observations and measurements were taken from 6 plants of each variety. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'CA28' with reference variety 'Morden Centennial'

Plant height (cm)

  'CA28' 'Morden Centennial'
mean 80.2 97.2
std. deviation 9.41 10.31

Number of petals

  'CA28' 'Morden Centennial'
mean 64 28
std. deviation 1.45 6.0

Flower diameter (cm)

  'CA28' 'Morden Centennial'
mean 9.6 9.0
std. deviation 1.3 0.69

Petal length (mm)

  'CA28' 'Morden Centennial'
mean 4.7 3.4
std. deviation 0.39 0.23

Petal width (mm)

  'CA28' 'Morden Centennial'
mean 3.8 3.4
std. deviation 0.70 0.12

Colour of inner side of petal (RHS)

  'CA28' 'Morden Centennial'
main 62A,B,C 55A
secondary 155D N/A

Click on image for larger view
Rose: 'CA28' (left) with reference variety 'Morden Centennial' (right)

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