Frosty Yocheryl


Denomination: 'Frosty Yocheryl'
Trade name: Frosty Cheryl
Botanical Name: Chrysanthemum ×morifolium
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: 519-631-6241
Application Date: 2009-10-30
Application Number: 09-6759
Grant of Rights Date: 2011-12-05
Certificate Number: 4228
Grant of Rights Termination Date: 2029-12-05

Variety Description

Variety used for comparison: 'Yowilma' (Wilma)

Summary: The plants of 'Frosty Yocheryl' are taller than the plants of 'Yowilma'. The leaf blade base of 'Frosty Yocheryl' is truncate and asymmetric while the leaf blade base of 'Yowilma' is obtuse to rounded. The ray floret tip is pointed and mamillate for 'Frosty Yocheryl' while the ray floret tip of 'Yowilma' is dentate. The outer side of the ray floret of 'Frosty Yocheryl' is white flushed with violet while the outer side of the ray floret of 'Yowilma' is very light yellow. The inner ray florets of 'Frosty Yocheryl' are light yellow with a flush of violet at the apex on the inner side while the inner ray florets of 'Yowilma' are yellow green to light yellow on the inner side.


PLANT: bushy, semi-upright, dense branching, green stem

LEAF: moderately upwards to horizontal attitude of petiole, long terminal lobe relative to leaf length, truncate and asymmetric base, upper side medium to dark green with absent to very weak glossiness
LOWEST LATERAL SINUS: medium depth, diverging to parallel margins

INFLORESCENCE: many flower heads per plant
RAY FLORETS: ligulate type, basal part moderately ascending to horizontal, upper surface with two keels, absent to very short corolla tube, flat profile in cross section at widest point, weakly involute to flat margin, involute part at basal half, straight longitudinal axis, ray florets in inner row moderately incurving along longitudinal axis, incurving at distal three quarters, pointed and mamillate tip, inner side white (RHS NN155B-C), outer side white (RHS NN155B-C) flushed with violet (RHS 75A-B), inner side of ray florets in inner row light yellow (RHS 4D) flushed with violet (RHS 75A-B) at apex, outer side light yellow (RHS 5D) with violet (RHS 75A-B) at apex.

Origin & Breeding History: The variety 'Frosty Yocheryl' originated from a naturally occurring whole plant mutation of the parent variety 'Cool Yocheryl'. The variety was discovered and selected by the breeder in November 2006 in Alva, Florida, USA. Selection was based on criteria for flower colour, plant habit and uniform flowering.

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

Comparison tables for 'Frosty Yocheryl' with reference variety 'Yowilma'

Plant height (cm)

  'Frosty Yocheryl' 'Yowilma'
mean 32.5 23.5
std. deviation 2.15 1.70

Colour of ray floret (RHS)

  'Frosty Yocheryl' 'Yowilma'
inner side NN155B-C NN155C
outer side NN155B-C, flushed with 75A-B 4D (lighter than)

Click on image for larger view
Frosty Yocheryl
Chrysanthemum: 'Frosty Yocheryl' (left) with reference variety 'Yowilma' (right)

Click on image for larger view
Frosty Yocheryl
Chrysanthemum: 'Frosty Yocheryl' (left) with reference variety 'Yowilma' (right)

Click on image for larger view
Frosty Yocheryl
Chrysanthemum: 'Frosty Yocheryl' (left) with reference variety 'Yowilma' (right)

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