Denomination: 'MP4'
Trade name: Tiny Tunia Burgundy
Botanical Name: Petunia ×hybrida
Applicant/Holder: NuFlora International Pty. Ltd.
63 Wills Road
Macquarie Fields, New South Wales
Breeder: Graham Noel Brown, Baulkham Hills, Australia
Agent in Canada: Variety Rights Management
475 County Road 18
R.R. #2
Oxford Station, Ontario
K0G 1T0
Tel: 613-258-9015
Application Date: 2000-06-21
Application Number: 00-2321
Date abandoned: 2008-10-01

Variety Description

Variety used for comparison: 'MP3' (Tiny Tunia Violet)

Summary: 'MP4' has a longer pedicel than 'MP3'. The corolla diameter of 'MP4' is slightly wider than 'MP3'. 'MP4' has a lighter violet flower colour than 'MP3'.


PLANT: creeping growth habit, short height
SHOOT: thin, short to medium length, absent or very weak anthocyanin colouration

LEAF: ovate to elliptic shape, broad acute apex, no variegation, light to medium green upper side, no blistering,

SEPAL: linear to obovate shape, no anthocyanin colouration
FLOWER: single type, funnel form shape
COROLLA: violet (RHS N78A) upper side, weakly conspicuousness purple veins on inner side, medium undulation of the margin
COROLLA TUBE: dark violet (RHS 83A) inner side, moderate conspicuousness of veins on inner side, anther light grey to violet colour

Origin & Breeding History: 'MP4' was developed from a Petunia x hybrida breeding program conducted by the breeder in Baulkham Hills, NSW, Australia. In 1993, a program to breed miniature trailing petunias was initiated. A number of smaller flowered petunias including Petunia integrifolia were crossed with a range of annual and double varieties. Two cycles of crossing and selection were undertaken each year until 1997 when promising F1 selections were coded in "A" series. These were crossed in 1997 to give further F1 selections. In 1998, X98.31 as the female parent was crossed with PJ39 as the male parent and given the breeders code X99.3.17. The new variety was selected from field and greenhouse trials during the fall of 1999 based on flower colour, flower size and plant habit.

Tests & Trials: Trials were conducted during the summer of 2006 in Oxford Station, Ontario. 15 plants of each variety were individually grown in 15cm pots in a poly house. Plants were spaced 30cm apart. Observations and measurements were taken on 10 plants of each variety. Colours were determined using the 2001 Royal Horticultural Society Colour Chart.

Comparison tables for 'MP4' with reference variety 'MP3'

Pedicel length (cm)

  'MP4' 'MP3'
mean 2.01 1.63
std. deviation 0.20 0.22

Corolla diameter (mm)

  'MP4' 'MP3'
mean 32.20 28.56
std. deviation 1.99 3.17

Corolla colour (RHS)

  'MP4' 'MP3'
upper side N78A N81A

Click on image for larger view
Petunia: 'MP4' (left) with reference variety 'MP3' (right)

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