Denomination: 'Yomanhattan'
Trade name: Manhattan
Botanical Name: Chrysanthemum
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: 2003-04-07
Application Number: 03-3552
Grant of Rights Date: 2007-11-22
Certificate Number: 3011
Date rights surrendered: 2014-10-03

Variety Description

Variety used for comparison: 'Yocovington' (Covington)

Summary: 'Yomanhattan' has longer ray floret corolla tubes than 'Yocovington'. The longitudinal axis of the majority of ray florets is straight for 'Yomanhattan' while it ranges from incurved to reflexed for 'Yocovington'.


PLANT: year round cultivation for pot production, disbud flowering type, 8 week response group, medium height
STEM: no anthocyanin colouration

LEAF: long, medium width, broad wedged to truncate base
LATERAL LOBE: diverging to parallel margins of sinus
LOWER LOBE: long, medium to deep sinus

FLOWER HEAD: double, decorative sub-type, self-coloured, yellow colour group of moderate to strong intensity, large diameter, no bracts among ray florets
RAY FLORET: medium to long blade with medium to long corolla tube, straight longitudinal axis of majority, mamillate to dentate tip, yellow on upper side, lighter yellow on lower side

Origin & Breeding History: 'Yomanhattan' is a product from a planned breeding program conducted by the breeder, Mrs. Wendy R. Bergman, an employee of Yoder Brothers, Inc. in Barberton, Ohio, USA. It originated from a cross made in November 1998 in Salinas, California, USA between Chrysanthemum variety 'Sierra' as the female parent and a proprietary Chrysanthemum seedling selection designated 'YB-4035' as the male parent. 'Yomanhattan' was selected in November 1999 in Fort Myers, Florida, USA based on its uniform plant growth habit, desirable inflorescence form and floret colours, fast response time and excellent post production longevity.

Tests & Trials: Trials for 'Yomanhattan' were conducted in the fall of 2006 at Yoder Canada Ltd. in Leamington, Ontario. They were performed under greenhouse conditions similar to those used in commercial Chrysanthemum production. 40 unrooted cuttings per variety were directly stuck into 15 cm pots with 4 cuttings per pot and 10 pots per variety. The pots were spaced 30 cm apart. The plants were pinched once prior to short day treatment. All plants had the centre bud removed. Measured characteristics were based on measurements taken from 10 plants or parts of plants on November 1-2, 2006. All colour determinations were made using the 2001 Royal Horticulture Society (RHS) Colour Chart.

Comparison tables for 'Yomanhattan' with reference variety 'Yocovington'

Ray floret corolla tube length (cm)

  'Yomanhattan' 'Yocovington'
mean 2.4 1.1
std. deviation 1.21 0.29

Ray floret colour (RHS)

  'Yomanhattan' 'Yocovington'
upper side 5B 4A
lower side 5C 4C

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

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