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Denomination: 'Argyros'
Trade name: Shere Monroe Rose
Botanical Name: Argyranthemum frutescens
Applicant/Holder: Syngenta Crop Protection AG
Schwarzwaldallee 215
Breeder: Ánna M.W.P. Houbraken, Syngenta Seeds B.V., Enkhuizen, Netherlands
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-317-7511
Application Date: 2006-11-22
Application Number: 07-6040
Grant of Rights Date: 2009-09-23
Certificate Number: 3608
Date rights surrendered: 2010-08-27

Variety Description

Variety used for comparison: 'Supasat' (Miss Pink)

Summary: The upper side of the leaves of 'Argyros' are blue green while those of 'Supasat' are medium green. The ray florets of 'Argyros' differ in colour from those of 'Supasat'.


PLANT: rounded growth habit, medium height, medium density, no stem anthocyanin colouration

LEAF BLADE: short to medium length, narrow to medium width, blue green on upper side
LEAF BLADE LATERAL LOBE: short to medium length, narrow, shallow marginal incisions

FLOWER: semi-double type, small to medium diameter, early flowering
RAY FLORET: straight curvature of longitudinal axis, short, two coloured on upper side, when newly opened the upper side is purple red (RHS 63A), when fully opened the upper side is blue pink (RHS 67C), when aged the upper side is blue pink (RHS N66D) with undertones of light blue violet (RHS 69C), white (RHS 155A) at base on upper side, when newly opened the lower side is purple red (RHS 59D), when fully opened the lower side is blue pink (RHS 70C), when aged the lower side is violet (RHS 75B)
FLORET DISC: very small to small diameter, yellow

Origin & Breeding History: 'Argyros' originated from a cross pollination of the female parent identified as G0101-4 by pollen from unidentified Argyranthemum frutescens plants in August 2003 in Enkhuizen, The Netherlands. The new Argyranthemum variety 'Argyros' was bred and developed by the breeder Anna M.W.P. Houbraken, while employed at Syngenta Seeds B.V., Enkhuizen, The Netherlands. The seedling was selected in August 2004 as a single plant based on plant growth habit and flower colour. Asexual reproduction by cuttings was first conducted August 2004 in Enkhuizen, The Netherlands.

Tests & Trials: Trials for 'Argyros' were conducted in a polyhouse during the spring of 2008 in St. Thomas, Ontario. The trials included a total of 15 plants each of the candidate and reference varieties. All plants were grown from rooted cuttings and transplanted into 11 cm pots on March 19, 2008. Observations and measurements were taken from 10 plants of each variety on May 23, 2008. All colour determinations were made using the 2001 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Argyros' with reference variety 'Supasat'

Flower head diameter (cm)

  'Argyros' 'Supasat'
mean 4.2 3.8
std. deviation 0.12 0.21

Colour of ray floret (RHS)

  'Argyros' 'Supasat'
upper side-newly opened 63A 71C, fades to 71D
upper side-fully opened 67C (155A at base) N74B with undertones of 75B (155A at base)
upper side-aged N66D with undertones of 69C 76C-D with 75B-C margins
lower side-newly opened lighter than 59D lighter than 72D
lower side-fully opened closest to 70C 77D
lower side-aged 75B closest to 69D

Click on image for larger view
Argyranthemum: 'Argyros' (left) with reference variety 'Supasat' (right)

Click on image for larger view
Argyranthemum: 'Argyros' (left) with reference variety 'Supasat' (right)

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