Denomination: 'USPLX50304'
Trade name: Intensia Orchid Blast
Botanical Name: Phlox
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: 09-6596
Grant of Rights Date: 2011-08-19
Certificate Number: 4143
Date rights surrendered: 2014-08-19

Variety Description

Variety used for comparison: 'USPHLO2' (Intensia Lilac Rose)

Summary: The pedicel of 'USPLX50304' is shorter than the pedicel of 'USPHL02'. The corolla is a star shape for 'USPLX50304' while it is round for 'USPHLO2'. The corolla lobe of 'USPLX50304' is narrower than the corolla lobe of 'USPHLO2'. The corolla lobe of 'USPLX50304' is obdeltate with a broad acute apex and medium fringe on the margin while the corolla lobe of 'USPHLO2' is obovate with a rounded apex and very weak fringe. The petals are free for 'USPLX50304' while they are overlapping for 'USPHLO2'. The upper side of the petal is a lighter violet colour for 'USPLX50304' than for 'USPHLO2'.


PLANT: upright bushy to rounded growth habit
STEM: thin at middle third, no anthocyanin colouration

LEAF: lanceolate shape, flat in cross section, acute apex, no variegation, no anthocyanin colouration, no margin undulation, glandular stickiness present, sparse pubescence on upper and lower side, upper side medium green

INFLORESCENCE: dome shape, no anthocyanin colouration in pedicel and calyx, early time of flowering
COROLLA: star shape, single, bicolour, purple colour group
PETAL: obdeltate, apex broad acute, medium fringe on margin, petals free, violet (RHS N78C) on upper side with purple (RHS N74A) eye marking at base, apical zone on lower side white (RHS NN155C) with violet (RHS N78C) along margin, basal zone on lower side white (RHS NN155C) with blush of violet (RHS N78C).

Origin & Breeding History: The variety 'USPLX50304' originated from a controlled cross conducted in Higashiomi, Shiga, Japan on June 12, 2005. The cross was between the female seed parent Phlox glabrifora (white form) and the male parent, a white flowered seedling. The new variety was selected as a single plant from the resultant progeny on July 6, 2006 in Bonsall, California, USA. The variety was selected based on compact growth habit, good plant vigour throughout the summer and good resistance to powdery mildew. Propagation by vegetative cuttings was first conducted on July 10, 2006 in Bonsall, California, USA.

Tests & Trials: Trials for 'USPLX50304' were conducted in a polyhouse during the spring of 2010 in St. Thomas, Ontario. The trial included a total of fifteen plants of the candidate and reference varieties. Rooted cuttings were transplanted into 15 cm pots on April 29, 2010. Observations and measurements were taken from ten plants or parts of plants on June 19, 2010. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'USPLX50304' with reference variety 'USPHLO2'

Pedicel length (cm)

  'USPLX50304' 'USPHLO2'
mean 0.7 1.2
std. deviation 0.18 0.15

Corolla lobe width (cm)

  'USPLX50304' 'USPHLO2'
mean 0.9 1.4
std. deviation 0.14 0.05

Colour of upper side of petal (RHS)

  'USPLX50304' 'USPHLO2'
apical zone N78C N78B

Click on image for larger view
Phlox: 'USPLX50304' (left) with reference variety 'USPHLO2' (right)

Click on image for larger view
Phlox: 'USPLX50304' (left) with reference variety 'USPHLO2' (right)

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