Kakegawa S63


Denomination: 'Kakegawa S63'
Trade name: Colorburst Pro Rose
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: 04-4033
Grant of Rights Date: 2007-01-24
Certificate Number: 2677
Date rights surrendered: 2009-03-06

Variety Description

Variety used for comparison: 'Kakegawa S42' (Colorburst Rose)

Summary: 'Kakegawa S63' has shorter shoots, shorter leaves, smaller flower diameter and shorter corolla tube than 'Kakegawa S42'. The leaves of 'Kakegawa S63' are darker green than those of 'Kakegawa S42'. Conspicuousness of the veins on the inner side of the corolla tube is strong for 'Kakegawa S63' while it is weak to moderately strong for 'Kakegawa S42'.


'Kakegawa S63' is a Calibrachoa variety with upright to creeping plant growth habit. The plants are short and the shoots are short with absent to very weak anthocyanin colouration. The shape of the leaf blade ranges from elliptic to obovate with a broad acute apex. The upper side of the leaf blade is dark green and there is no variegation. There is no petiole.

The flowers produced by 'Kakegawa S63' are single type. Anthocyanin colouration of the sepals is absent. The degree of lobing of the corolla is weak. The flowers are bright purple on the inner side and blue pink on the outer side. The lobes of the corolla have a round to truncate shaped apex. The inner side of the corolla tube is yellow and conspicuousness of the veins within the corolla tube is strong.

Origin & Breeding History: 'Kakegawa S63' originated from a hybridization conducted in November of 1998 in Kakegawa, Japan. The female parent was the breeding line designated '8D-48' with deep blue flowers and mounding plant growth habit and the male parent was the breeding line designated '97-1176' with deep rose 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 were selected for vegetative propagation. In February 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 S63'.

Tests & Trials: The test and trial for 'Kakegawa S63' 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 S63' with reference variety 'Kakegawa S42'

Leaf blade length (cm)

  'Kakegawa S63' 'Kakegawa S42'
mean 2.04 3.69
std. deviation 0.33 0.49

Flower diameter (mm)

  'Kakegawa S63' 'Kakegawa S42'
mean 25.10 29.60
std. deviation 1.60 2.55

Corolla tube length (mm)

  'Kakegawa S63' 'Kakegawa S42'
mean 13.90 16.10
std. deviation 1.10 0.88

Corolla colour (RHS)

  'Kakegawa S63' 'Kakegawa S42'
inner side N74A N74A
outer side N74C/D N74C/D

Colour of corolla tube (RHS)

  'Kakegawa S63' 'Kakegawa S42'
inner side 2A/B 2A

Click on image for larger view
Kakegawa S63
Calibrachoa: 'Kakegawa S63' (left) with reference variety 'Kakegawa S42' (right)

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