Denomination: 'Yoessex'
Trade name: Essex
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: 2008-04-03
Application Number: 08-6270
Grant of Rights Date: 2013-04-26
Certificate Number: 4504
Date rights surrendered: 2015-04-26

Variety Description

Variety used for comparison: 'Yolompoc' (Lompoc)

Summary: The plants of 'Yoessex' are shorter and wider than the plants of 'Yolompoc'. The flower head of 'Yoessex' is larger in diameter than the flower head of 'Yolompoc'. The ray floret of 'Yoessex' is longer than the ray floret of 'Yolompoc'. The disc of 'Yoessex' is mostly green before anther dehiscence while the disc of 'Yolompoc' is light yellow.


PLANT: bushy type, semi-upright growth habit, green stem

PETIOLE: medium length relative to leaf length
LEAF: terminal lobe medium in length relative to leaf length, lowest lateral sinus medium to deep with diverging to parallel margins, base obtuse to truncate, upper side medium to dark green with absent or weak glossiness, medium number of medium depth margin indentations

FLOWER: many flower heads per plant, outer side of bud purple (RHS 64A), semi-double daisy head type
RAY FLORETS: one to two rows, predominantly ligulate type, moderately ascending attitude, upper surface with two keels, very short to short corolla tube, weakly concave profile in cross section, flat margin, weak reflexing along longitudinal axis at distal quarter, tip emarginate and dentate
RAY FLORET: inner side purple (RHS 70B) with a darker purple (RHS 71A-B) overlay, outer side blue pink (RHS N74D) with light blue violet (RHS 76C) along margins
DISC: small diameter relative to head diameter, slightly domed in cross section, mostly green before anther dehiscence with no dark spot at centre, light yellow at anther dehiscence.

Origin & Breeding History: The variety 'Yoessex' originated from a controlled pollination conducted in February 2003 in Salinas, California, USA. The female parent was a proprietary seedling designated YB-A2654 and the male parent was a proprietary seedling designated YB-A2409. The new variety was selected in Fort Myers, Florida, USA, in November 2003. The selection criteria included compact growth habit, strong stems, flowering response time, flower form and colour, and excellent post production longevity. Asexual reproduction by vegetative tip cuttings was first conducted in Fort Myers, Florida, USA in February 2004.

Tests & Trials: Trials for 'Yoessex' were conducted in a greenhouse trial during the Fall of 2011 in Niagara-on-the-Lake, Ontario. On August 8, 2011, fifty unrooted cuttings were directly stuck into 15 cm pots, with 5 cuttings per pot. The trial included a total of 10 pots of each variety spaced 30 cm apart. Plants were pinched once prior to short day treatment. Observations and measurements were taken from 10 plants of each variety on November 7, 2011. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Yoessex' with reference variety 'Yolompoc'

Plant height (cm)

  'Yoessex' 'Yolompoc'
mean 24.0 31.0
std. deviation 2.36 2.08

Plant width (cm)

  'Yoessex' 'Yolompoc'
mean 46.0 37.9
std. deviation 3.68 1.96

Flower head diameter (cm)

  'Yoessex' 'Yolompoc'
mean 7.7 6.4
std. deviation 0.48 0.42

Ray floret length (cm)

  'Yoessex' 'Yolompoc'
mean 3.7 3.1
std. deviation 0.17 0.13

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

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

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