Kakegawa S64


Denomination: 'Kakegawa S64'
Trade name: Colorburst Pro Blue
Botanical Name: Calibrachoa
Applicant/Holder: Sakata Seed Corporation
2-7-1 Nakamachidai
Breeder: Sakata Seed Corporation, Yokohama, Japan
Agent in Canada: Variety Rights Management
475 County Road 18
R.R. #2
Oxford Station, Ontario
K0G 1T0
Tel: 613-258-9015
Application Date: 2004-02-11
Application Number: 04-4034
Grant of Rights Date: 2007-01-24
Certificate Number: 2678
Date rights surrendered: 2009-03-06

Variety Description

Variety used for comparison: 'Kakegawa S1'

Summary: 'Kakegawa S64' has shorter shoots, shorter leaves and shorter sepals than 'Kakegawa S1'. The inner side of the corolla for 'Kakegawa S64' is violet blue with lighter violet blue secondary colour in the area of transition to the corolla tube while for 'Kakegawa S1', it is violet. The inner side of the corolla tube is yellow orange for 'Kakegawa S64' while it is yellow green for 'Kakegawa S1'.


'Kakegawa S64' is a Calibrachoa variety with upright to creeping plant growth habit. The plants are short and the shoots are short with very weak anthocyanin colouration. The shape of the leaf blade ranges from elliptic to obovate with an obtuse apex. The upper side of the leaf blade is medium green and there is no variegation. There is no petiole.

The flowers produced by 'Kakegawa S64' are single type. Anthocyanin colouration of the sepals is absent. The degree of lobing of the corolla is weak. The inner side of the corolla is violet blue with lighter violet blue secondary colour in the area of transition to the corolla tube. The outer side of the corolla is violet blue. The lobes of the corolla have a truncate shaped apex. The inner side of the corolla tube is yellow orange and conspicuousness of the veins within the corolla tube is strong.

Origin & Breeding History: 'Kakegawa S64' originated from a hybridization conducted in November of 1998 in Kakegawa, Japan. The female parent was variety 'Kakegawa S1' and the male parent was an unnamed breeding line designated '97-1176' with deep rose coloured flowers, mounding plant growth habit and short internodes. In February of 1999, F1 seed was sown and the resulting seedlings were transplanted outdoors. Three plants with blue flowers were selected and intercrossed to produce F2 generation seed. From the F2 plants, two were selected for their extra compact to mounded plant growth habit and vegetatively propagated. In August of 2002, these selections were planted in 9 cm hanging pots for evaluation in greenhouse and open field trials. Using new vegetatively propagated plants, one selection was further evaluated in Salinas, California, USA during 2003. This selection was named 'Kakegawa S64'.

Tests & Trials: The test and trial for 'Kakegawa S64' was conducted in a polyhouse at Variety Rights Management in Oxford Station, Ontario during the summer of 2005. The trial included 15 plants of each variety grown in 10 cm pots. The plants were spaced 13 cm apart. All colour characteristics were determined using the 2001 Royal Horticultural Society (RHS) colour chart and measured characteristics were based on ten measurements.

Comparison tables for 'Kakegawa S64' with reference variety 'Kakegawa S1'

Leaf blade length (cm)

  'Kakegawa S64' 'Kakegawa S1'
mean 2.36 2.86
std. deviation 0.13 0.30

Sepal length (mm)

  'Kakegawa S64' 'Kakegawa S1'
mean 15.30 17.90
std. deviation 0.82 2.02

Colour of corolla (RHS)

  'Kakegawa S64' 'Kakegawa S1'
primary - inner side N92B N87A/B
secondary - inner side N92C N/A
outer side 93C N87D

Colour of corolla tube (RHS)

  'Kakegawa S64' 'Kakegawa S1'
inner side 15C 150D

Click on image for larger view
Kakegawa S64
Calibrachoa: 'Kakegawa S64' (top left) and 'Kakegawa S80' (top right) with reference variety 'Kakegawa S1' (bottom)

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