Denomination: 'Yohollister'
Trade name: Hollister
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: 2006-09-26
Application Number: 06-5578
Grant of Rights Date: 2011-03-17
Certificate Number: 4027
Date rights surrendered: 2015-01-22

Variety Description

Variety used for comparison: 'Yobrighton' (Brighton)

Summary: 'Yohollister' has a smaller flower head diameter and shorter ray floret length than 'Yobrighton'. 'Yohollister' has a light yellow disc colour at anther dehiscence while 'Yobrighton' has a yellowish green disc colour.


PLANT: spray flowering type, pot plant, 8 week response group, semi upright bushy growth habit, green stem

LEAF: terminal lobe medium in length relative to leaf length, lowest lateral lobe sinus medium in depth with parallel, converging and touching margins, base truncate, upper side medium green

FLOWER HEAD: semi-double daisy type, medium density of ray florets
RAY FLORETS: ligulate, very short corolla tube, moderately ascending to horizontal attitude at basal part, flat in cross section at widest point, straight along longitudinal axis, emarginate and mamillate tip, inner side yellow (RHS 7A) with lighter yellow tones (RHS 7B-C), outer side light yellow (RHS 8B)
DISC: small diameter relative to head diameter, yellow green before anther dehiscence, no dark spot present at centre before dehiscence, light yellow at anther dehiscence.

Origin & Breeding History: 'Yohollister' originated from a controlled cross between the female parent 'Durban' and the male parent, 'YB-A1635'. The cross was made by the breeder, Mrs. Wendy Bergman, in February 2003, in Salinas, California, USA. A single seedling from the resultant progeny was selected in December 2003, in Fort Myers, Florida. 'Yohollister' was selected based on its uniform growth habit, desirable inflorescence form, floret colour, fast response time and suitability for year round production. Asexual reproduction of the variety by vegetative tip cuttings was first conducted in Fort Myers, Florida, USA in March 2004.

Tests & Trials: Trials for 'Yohollister' were conducted in Leamington, Ontario, in the fall of 2009. Flowering trials were performed under greenhouse conditions similar to those used in commercial chrysanthemum production. Forty unrooted cuttings of both the candidate and reference variety were directly stuck into 15 cm pots, with 4 cuttings per pot, 10 pots per variety, planted on August 24, 2009. Plants were spaced 30 cm apart and pinched once prior to short day treatment. All plants had the center bud removed. Observations and measurements were taken from 10 plants of each variety on November 6, 2009. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Yohollister' with reference variety 'Yobrighton'

Flower head diameter (cm)

  'Yohollister' 'Yobrighton'
mean 8.2 9.0
std. deviation 0.19 0.41

Ray floret length (cm)

  'Yohollister' 'Yobrighton'
mean 2.3 3.9
std. deviation 1.19 0.34

Colour of ray floret (RHS)

  'Yohollister' 'Yobrighton'
inner side 7A with tones of 7B-C 6A
outer side 8B 8A, mottled with 6A

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

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

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