Denomination: 'Yorockport'
Trade name: Rockport
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: 2004-10-01
Application Number: 04-4432
Grant of Rights Date: 2008-11-24
Certificate Number: 3413
Grant of Rights Termination Date: 2026-11-24

Variety Description

Variety used for comparison: 'Yolompoc' (Lompoc)

Summary: 'Yorockport' has a broader leaf and larger disc diameter than 'Yolompoc'. The upper side of the ray floret of 'Yorockport' is darker purple with a stronger purple over-colour than that of 'Yolompoc'.


PLANT: year round cultivation for pot production, spray flowering type, 8 week response group
STEM: green, no anthocyanin colouration

LEAF: medium green, 1.5:1 length/width ratio, obtuse base, parallel margins of sinus between lateral lobes

INFLORESCENCE: corymbiform
FLOWER HEAD: semi-double daisy type, self-coloured, dark red purple colour group, moderately dense ray florets
RAY FLORET: ligulate, longitudinal axis of majority is straight, mostly flat in cross-section, mamillate tip, purple with darker purple over-colour on upper side, diffuse striped colour pattern on upper side, violet with purple central stripe on lower side
DISC: yellow green before anther dehiscence, yellow orange at anther dehiscence

Origin & Breeding History: 'Yorockport' is a product of 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 between proprietary Chrysanthemum seedling selection designated 'YB-4891' as the female parent and another proprietary Chrysanthemum seedling selection designated 'YB-4554' as the male parent. This cross was conducted by the breeder in October 1997, in Salinas, California, USA. 'Yorockport' was discovered and selected in December 1998, as a single flowering plant among the progeny of the stated cross growing in a controlled environment in Fort Myers, Florida, USA. The selection of this plant was based on its uniform plant growth habit, desirable inflorescence form and floret colours, fast response time and excellent post-production longevity. Asexual reproduction of 'Yorockport' by vegetative tip cuttings was first conducted in Fort Myers, Florida, USA in March 1999.

Tests & Trials: Trials for 'Yorockport' were conducted in the fall of 2007 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 central bud removed. Observations and measurements were taken from 10 plants of each variety on October 29, 2007. All colour determinations were made using the 2001 Royal Horticulture Society (RHS) Colour Chart.

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

Leaf width (cm)

  'Yorockport' 'Yolompoc'
mean 5.9 4.2
std. deviation 0.28 0.27

Colour of upper side of ray floret (RHS)

  'Yorockport' 'Yolompoc'
main / background 64A-B 70B
over-colour strong intensity of 61A moderate intensity of 61A

Disc diameter (cm)

  'Yorockport' 'Yolompoc'
mean 1.4 1.2
std. deviation 0.07 0.08

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

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

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