Denomination: 'USPHLOTM6'
Trade name: Intensia White
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: 2005-05-06
Application Number: 05-4883
Grant of Rights Date: 2007-06-08
Certificate Number: 2803
Date rights surrendered: 2010-07-15

Variety Description

Variety used for comparison: 'Sunphloho' (Astoria White)

Summary: USPHLOTM6' has a more trailing growth habit than 'Sunphloho'. The plant height of 'USPHLOTM6' is slightly taller than 'Sunphloho'. 'USPHLOTM6' is absent of glandular stickiness on the leaf while it is present in 'Sunphloho'. The shape of the flower petal apex in 'USPHLOTM6' is cuspidate while it is broad acute in 'Sunphloho'. 'USPHLOTM6' has a stronger fringed flower petal than 'Sunphloho'.


PLANT: annual type, semi-upright to trailing growth habit, flowers early in the season

LEAF: subulate shape, glandular stickiness absent, medium to dense pubescence on upper and lower side, dark green colour

INFLORESCENCE: flat shaped, compound cyme type
FLORET: round shape, mono-coloured, white colour group
PETAL: cuspidate shaped apex, strong fringing of the margin, white (RHS 155C) apical zone on upper side, white (RHS 155C) basal zone, white (RHS 155C) apical zone on lower side, white (RHS 155C) basal zone on lower side

Origin & Breeding History: 'USPHLOTM6' is the product of a planned breeding program with the objectives to create new vigorous Phlox varieties that are heat tolerant and have a long flowering period. 'USPHLO419' originated from a controlled cross conducted in Hikone, Japan on March 23, 2000, with a seed raised Phlox drummondi variety with white flowers as the female parent and a wild Phlox sp. as the male parent. The new phlox was selected as a single plant from the resultant progeny on May 19, 2001. Selection criteria included strong plant vigour, tolerance to heat, long flowering period and low seed set.

Tests & Trials: Tests and trials were conducted in a polyhouse during the spring of 2006 in St. Thomas, Ontario. Trials included 15 plants each of the candidate and reference variety. Observations and measurements were taken from 10 plants. All colour measurements were made using RHS colour chart 2001.

Comparison table for 'USPHLOTM6' with reference variety 'Sunphloho'

Plant height (cm)

  'USPHLOTM6' 'Sunphloho'
mean 20.6 17.3
std. deviation 3.85 2.92

Click on image for larger view
Phlox: 'USPHLOTM6' (left) with reference variety 'Sunphloho' (right)

Click on image for larger view
Phlox: 'USPHLOTM6' (left) with reference variety 'Sunphloho' (right)

Date modified: