Denomination: 'Yosonoma'
Trade name: Sonoma
Botanical Name: Chrysanthemum ×morifolium
Applicant/Holder: Syngenta Crop Protection AG
Schwarzwaldallee 215
Breeder: Wendy Bergman, Syngenta Flowers, Inc., Alva, 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: 2005-10-03
Application Number: 05-5067
Grant of Rights Date: 2010-03-19
Certificate Number: 3820
Date rights surrendered: 2014-02-24

Variety Description

Variety used for comparison: 'Yorockport'

Summary: The leaves of 'Yosonoma' are narrower than those of 'Yorockport'. 'Yosonoma' has a larger flower head diameter and more ray florets than 'Yorockport'. The ray florets of 'Yosonoma' are longer than those of 'Yorockport'.


PLANT: year round cultivation for pot production, pinched type, spray flowering type, 9 week response group
STEM: green

LEAF: acute base, parallel to diverging margins of sinus between lateral lobes, medium green

INFLORESCENCE: flat corymbiform
FLOWER HEAD: semi-double daisy type, self coloured, deep intensity of colour, medium density of ray florets
RAY FLORET: ligulate with at least one quilled per plant, reflexing longitudinal axis of majority, weak strength of curvature, flat to slightly concave in cross section, mamillate tip, purple (RHS 71B-61B) with blue pink (RHS 72D) tones on upper side, violet (RHS 75C) with blue pink (RHS 72D) mid-zone on lower side
DISC: green before anther dehiscence, medium yellow at anther dehiscence
DISC FLORETS: enlarged tubular, massed in center

Origin & Breeding History: 'Yosonoma' originated from a cross pollination made in February 2001 in Salinas, California, United States, between an unidentified female parent proprietary seedling and the male parent proprietary seelding selection YB-4976. The new variety was the product of a planned breeding program conducted by the breeder, Mrs. Wendy Bergman. 'Yosonoma' was discovered and selected by the breeder as a single flowering plant in March 2002. Selection of 'Yosonoma' was based on plant growth habit, inflorescence form, floret colours, response time and postproduction longevity. Asexual reproduction of the variety by vegetative tip cuttings was first conducted in Fort Myers, Florida, United States in June 2002.

Tests & Trials: Trials for 'Yosonoma' were conducted in Leamington, Ontario in the fall of 2008. Flowering trials were performed under greenhouse conditions similar to those used in commercial chrysanthemum production. Forty unrooted cuttings of the candidate were directly stuck into 15 cm pots, with 4 cuttings per pot, 10 pots per variety planted on August 11, 2008. Plants were spaced 30 cm apart and pinched once prior to short day treatment. All plants had the centre bud removed. Observations and measurements were taken from 10 plants of each variety on November 3, 2008. All colour determinations were made using the 2001 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Yosonoma' with reference variety 'Yorockport'

Leaf width (cm)

  'Yosonoma' 'Yorockport'
mean 4.7 5.5
std. deviation 0.44 0.34

Flower head diameter (cm)

  'Yosonoma' 'Yorockport'
mean 9.1 7.1
std. deviation 0.55 0.30

Number of ray florets

  'Yosonoma' 'Yorockport'
mean 43.0 24.0

Ray floret length (cm)

  'Yosonoma' 'Yorockport'
mean 4.3 2.9
std. deviation 0.24 0.09

Click on image for larger view
Chrysanthemum: 'Yosonoma' (left) with reference variety 'Yorockport' (right)

Click on image for larger view
Chrysanthemum: 'Yosonoma' (left) with reference variety 'Yorockport' (right)

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