Denomination: 'Sunmilk'
Trade name: Surfinia Royal Milk Tea
Botanical Name: Petunia ×hybrida
Applicant/Holder: Suntory Flowers Limited
Administrative Division
4-17-5 Shiba, Minato-ku
Tel: +81-3-5419-1382

Keisei Rose Nurseries Inc.
1-12-1 Oshiage
Breeder: Takuro Ishihara, Tokyo, Japan
Shinya Miyano, Chiba-ken, Japan
Kazunari Iwaki, Shiga, Japan
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-631-6241
Application Date: 2004-08-27
Application Number: 04-4337
Grant of Rights Date: 2007-11-09
Certificate Number: 2982
Date rights surrendered: 2010-11-25

Variety Description

Varieties used for comparison: 'Keiyesusu' (Surfinia Baby Yellow Compact) and 'Sunraspberry' (Surfinia Victorian Pearl)

Summary: 'Sunmilk' has a larger flower diameter than the reference varieties. The corolla of 'Sunmilk' has purple-red veins while the corolla of 'Keiyesusu' has yellow veins. 'Sunmilk' has less conspicuous veins on the corolla lobe than 'Sunraspberry'.


PLANT: upright growth habit, medium height and width

SHOOTS: medium thickness, medium length, absent to very weak anthocyanin colouration

LEAVES: short, narrow to medium width, ovate to elliptic, obtuse apex, no variegation, medium green on upper side, blistering present, petiole short to medium length

SEPALS: short, narrow to medium width, linear to lanceolate, no anthocyanin colouration

FLOWERS: medium length pedicel, single corolla, medium diameter, trumpet shape
COROLLA: weak lobing, white on upper side, white on lower side with yellow green around veins, veins purple red and moderately conspicuous, margin with strong undulation
COROLLA TUBE: medium length, greyish on inner side, veins moderately conspicuous
ANTHERS: yellowish white before and after dehiscence.

Origin & Breeding History: 'Sunmilk' originated from a controlled cross between a hybrid variety named 'PF165-1'as the female parent and 'PF171-1' as the male parent. The cross was made in December, 2000 at the Omi R&D Center, Suntory Flowers Ltd., Japan. In April 2001, 40 seedlings were obtained from the cross and grown in pots in the glasshouse for evaluation. In August 2001, one seedling was selected based on its growth habit, flower size and colour. That seedling was propagated by cuttings and a trial was carried out by flower potting and bedding from April to September 2002.

Tests & Trials: The tests and trials for 'Sunmilk' were conducted in a polyhouse at BioFlora in St. Thomas, Ontario in the spring of 2006. The trials included 15 plants of each variety. Rooted cuttings were transplanted into six inch pots on April 17, 2006. Observations and measurements were taken from 10 plants of each variety. All colour measurements were made using the 2001 Royal Horticultural Society Colour Chart.

Comparison tables for 'Sunmilk' with reference varieties 'Keiyesusu' and 'Sunraspberry'

Flower diameter (cm)

  'Sunmilk' 'Keiyesusu' 'Sunraspberry'
mean 5.4 4.1 4.8
std. deviation 0.15 0.32 0.19

Colour of corolla (RHS)

  'Sunmilk' 'Keiyesusu' 'Sunraspberry'
upper side 155A, C 150D, 154D near veins white/N155B
lower side 155A, 150D around veins 150D, 154D near veins white/N155B
veins 59C 151B 61B (brighter than)

Colour of corolla tube (RHS)

  'Sunmilk' 'Keiyesusu' 'Sunraspberry'
inner side 157A 151B 157A

Click on image for larger view
Petunia: 'Sunmilk' (left) with reference varieties 'Keiyesusu' (centre) and 'Sunraspberry' (right)

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