Denomination: 'USTUNI6504'
Trade name: Supertunia Mini Purple Improved
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: 2005-05-06
Application Number: 05-4879
Grant of Rights Date: 2007-08-17
Certificate Number: 2872
Grant of Rights Termination Date: 2025-08-17

Variety Description

Variety used for comparison: 'Sunripami' (Surfinia Baby Purple)

Summary: 'USTUNI6504' has a smaller flower diameter than 'Sunripami'. 'USTUNI6504' has more conspicuous veins on the upper side of the corolla lobe than 'Sunripami'.


PLANT: semi upright to creeping growth habit, short, medium to wide

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

LEAVES: medium length and width, elliptic, broad acute apex, no variegation, medium to dark green on upper side, no blistering, petiole short in length

SEPALS: short to medium length, narrow, linear, no anthocyanin colouration

FLOWERS: short to medium length pedicel, single corolla, very small to small diameter, salverform shape
COROLLA: moderate lobing, red purple on upper side, blue pink to violet on lower side, veins purple and moderately conspicuous, margin with weak undulation
COROLLA TUBE: short to medium length, violet on inner side, veins strong to very strongly conspicuous
ANTHERS: light grey before and after pollen dehiscence.

Origin & Breeding History: 'USTUNI6504' originated from a controlled cross between a seed raised variety with red flowers as the female parent and a wild Petunia species as the male parent. The cross was made by the breeder, Ushio Sakazaki, in Shiga, Japan on April 25, 2001. The seed from the cross was collected and sent to Gensingen, Germany for further breeding and selection. The new petunia was selected as a single plant from the resultant progeny on June 18, 2002, in Gensingen, Germany. Selection was based on improved branching characteristics and growth habit.

Tests & Trials: The tests and trials for 'USTUNI6504' 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 'USTUNI6504' with reference variety 'Sunripami'

Corolla diameter (cm)

  'USTUNI6504' 'Sunripami'
mean 4.1 4.8
std. deviation 0.08 0.14

Colour of corolla (RHS)

  'USTUNI6504' 'Sunripami'
upper side N74A (redder than) N74A (redder than)
lower side 71D, N78D towards corolla tube 72C, N78D towards corolla tube

Colour of corolla tube (RHS)

  'USTUNI6504' 'Sunripami'
inner side N81B 83D

Click on image for larger view
Petunia: 'USTUNI6504' (left) with reference variety 'Sunripami' (right)

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