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Denomination: 'Synfrost'
Trade name: Frost
Botanical Name: Aster
Applicant/Holder: Syngenta Crop Protection AG
Schwarzwaldallee 215
Breeder: Mark Smith, Syngenta Flowers, Inc., Gilroy, United States of America
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-317-7511
Application Date: 2009-10-30
Application Number: 09-6776
Grant of Rights Date: 2011-12-05
Certificate Number: 4225
Date rights surrendered: 2014-10-03

Variety Description

Variety used for comparison: 'Margrethe Viking'

Summary: The plants of 'Synfrost' have a hemispherical growth habit while those of 'Margrethe Viking' have a semi-upright growth habit. The plants of 'Synfrost are narrower than those of 'Margrethe Viking'. The flower head of 'Synfrost' has a smaller diameter than that of 'Margrethe Viking'. The upper side of the ray floret of 'Synfrost' develops violet tones towards the apex with age while that of 'Margrethe Viking' does not. The involucre of 'Synfrost' has a smaller diameter than that of 'Margrethe Viking'.


PLANT: hemispherical growth habit, medium height
STEM: semi-erect branch attitude, thin, many branches, hairiness ranging from medium to dense, no anthocyanin colouration on internode or leaf axil

LEAF: elliptic and ovate, no dentations, medium green, absent to very weak anthocyanin

FLOWER HEAD: distributed on distal part of side branches of the first order, more than two whorls of ray florets, medium number of ray florets
RAY FLORET: narrow obovate, predominantly ligulate, straight tip, flat in cross section, rounded apex, dentation of apex present, white (RHS NN155D) on upper side, aging to white (RHS NN155D) with violet (RHS 75B-C) tones at apex on upper side
INVOLUCRE: funnel-shaped, many bracts, adpressed position of bracts
DISC: yellow
DISC FLORET: yellowish corolla lobe

Origin & Breeding History: 'Synfrost' originated from an open pollinated cross between the female parent variety 'Patricia Viking' and pollen from an unknown male parent variety. The new variety was bred and developed by the breeder Mark Smith in August 2003 in Alva, Florida, USA. The resultant seed from the cross was sown in a greenhouse in April 2004 in Alva, Florida. The new variety was selected as a single plant from the progeny in October 2004 based on plant growth habit, flower colour, flower colour and flower longevity.

Tests & Trials: Trials for 'Synfrost' were conducted in an outdoor irrigated trial during the summer of 2010 in St. Thomas, Ontario. The trial included a total of 15 plants each of the candidate and reference variety. All plants were grown from a single rooted cutting transplanted into a 20 cm standard pot on June 29, 2010. Observations and measurements were taken from 10 plants of the candidate variety and reference variety on September 29, 2010. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Synfrost' with reference variety 'Margrethe Viking'

Plant width (cm)

  'Synfrost' 'Margrethe Viking'
mean 34.9 45.6
std. deviation 1.07 1.34

Flower head diameter (cm)

  'Synfrost' 'Margrethe Viking'
mean 3.3 3.7
std. deviation 0.16 0.21

Colour of aged ray floret (RHS)

  'Synfrost' 'Margrethe Viking'
upper side NN155D with 75B-C tones at apex NN155D

Involucre diameter (cm)

  'Synfrost' 'Margrethe Viking'
mean 0.8 1.2
std. deviation 0.02 0.08

Click on image for larger view
Aster: 'Synfrost' (left) with reference variety 'Margrethe Viking' (right)

Click on image for larger view
Aster: 'Synfrost' (left) with reference variety 'Margrethe Viking' (right)

Click on image for larger view
Aster: 'Synfrost' (left) with reference variety 'Margrethe Viking' (right)

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