Denomination: 'USTUN19603'
Trade name: Supertunia Pink Charm
Botanical Name: Petunia ×hybrida
Applicant/Holder: Plant 21 LLC
32149 Aquaduct Road
Bonsall, California
United States of America
Breeder: Ushio Sakazaki, Shiga, Japan
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-631-6241
Application Date: 2009-03-27
Application Number: 09-6594
Grant of Rights Date: 2011-05-31
Certificate Number: 4079
Date rights surrendered: 2016-05-31

Variety Description

Varieties used for comparison: 'Sunsurfpaspimi' (Surfinia Pastel Pink) and 'Dantun3' (Littletunia Sweet Pink)

Summary: The plants of 'USTUN19603' are wider than those of 'Dantun3'. The leaves of 'USTUN19603' are smaller than those of 'Sunsurfpaspimi'. The petioles of 'USTUN19603' are longer than those of 'Dantun3'. The sepals of 'USTUN19603' are shorter than those of 'Sunsurfpaspimi'. The flowers of 'USTUN19603' are smaller than those of 'Sunsurfpaspimi' and larger than those of 'Dantun3'. The upper side of the corolla lobes of 'USTUN19603' are two coloured while those of 'Sunsurfpaspimi' are one coloured. The apex of the corolla lobes of 'USTUN19603' are cuspidate while those of 'Dantun3' are rounded. The inner side of the corolla tubes of 'USTUN19603' are light blue violet with absent to very weak conspicuousness of veins while those of 'Dantun3' are light yellow with medium conspicuousness of veins.


PLANT: upright to creeping growth habit, thin shoot

LEAF: ovate to elliptic, narrow acute apex, no variegation, medium green on upper side, no blistering

SEPAL: linear, no anthocyanin colouration
FLOWER: single type, salverform, yellow veins
COROLLA LOBE: two colours on upper side, purple to blue pink (RHS N74B-C) with white (RHS NN155C) at transition to corolla tube on upper side, absent or very weak conspicuousness of veins on upper side, cuspidate apex, weak to medium undulation of margin
COROLLA TUBE: light blue violet (RHS 76C-D) on inner side, absent to very weak light green (RHS 145D) veins on inner side, yellowish white anthers before dehiscence

Origin & Breeding History: 'USTUN19603' originated from a controlled cross between the female parent variety 'Little Holiday Pink' and the male parent 'Bluette Frill Pink'. The cross was conducted by the breeder Ushio Sakazaki on May 14, 2004 in Hikone, Shiga, Japan. 'USTUN19603' was selected as a single plant from the resultant progeny on May 26, 2005 in Bonsall, California, United States. The new variety was selected based on branching characteristics, number of flowers, flower size and performance throughout the summer. 'USTUN19603' was first propagated by vegetative cuttings on May 30, 2005 in Bonsall, California, United States.

Tests & Trials: Trials for 'USTUN19603' were conducted in a polyhouse during the spring of 2010 in St. Thomas, Ontario. The trial included a total of 15 plants each of the candidate and reference varieties. All plants were grown from rooted cuttings and transplanted into 15 cm pots on April 27, 2010. Observations and measurements were taken from 10 plants of each variety on June 1, 2010. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'USTUN19603' with reference varieties 'Sunsurfpaspimi' and 'Dantun3'

Plant width (cm)

  'USTUN19603' 'Sunsurfpaspimi' 'Dantun3'
mean 36.9 40.2 27.8
std. deviation 1.58 2.5 2.39

Leaf blade length (cm)

  'USTUN19603' 'Sunsurfpaspimi' 'Dantun3'
mean 2.6 4.6 2.2
std. deviation 0.20 0.19 0.15

Leaf blade width (cm)

  'USTUN19603' 'Sunsurfpaspimi' 'Dantun3'
mean 1.4 2.6 1.2
std. deviation 0.12 0.18 0.07

Petiole length (cm)

  'USTUN19603' 'Sunsurfpaspimi' 'Dantun3'
mean 0.7 0.8 0.3
std. deviation 0.16 0.17 0.05

Sepal length (cm)

  'USTUN19603' 'Sunsurfpaspimi' 'Dantun3'
mean 0.6 1.3 0.7
std. deviation 0.12 0.10 0.13

Flower diameter (cm)

  'USTUN19603' 'Sunsurfpaspimi' 'Dantun3'
mean 3.2 5.8 2.3
std. deviation 0.15 0.11 0.13

Colour of corolla tube (RHS)

  'USTUN19603' 'Sunsurfpaspimi' 'Dantun3'
inner side 76C-D 76D 4D

Click on image for larger view
Petunia: 'USTUN19603' (left) with reference variety 'Sunsurfpaspimi' (center) and 'Dantun3' (right)

Click on image for larger view
Petunia: 'USTUN19603' (left) with reference variety 'Sunsurfpaspimi' (center) and 'Dantun3' (right)

Click on image for larger view
Petunia: 'USTUN19603' (left) with reference variety 'Sunsurfpaspimi' (center) and 'Dantun3' (right)

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