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Denomination: 'Chewhocan'
Trade name: Oso Easy Lemon Zest
Botanical Name: Rosa
Applicant/Holder: Spring Meadow Nursery, Inc.
12601 120th Avenue
Grand Haven, Michigan
United States of America
Breeder: Christopher Hugh Warner, Newport, Shropshire, United Kingdom
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-317-7511
Application Date: 2012-09-07
Application Number: 12-7729
Grant of Rights Date: 2015-10-13
Certificate Number: 5130
Grant of Rights Termination Date: 2035-10-13

Variety Description

Varieties used for comparison: 'Scrivjean' (Oso Easy Honey Bun) and 'Sunny Knock Out'

Summary: The plants of 'Chewhocan' are taller than those of 'Scrivjean' and shorter than those of 'Sunny Knock Out'. The leaf of 'Chewhocan' is smaller than that of 'Sunny Knock Out'. The upper side of the leaf for 'Chewhocan' has medium glossiness whereas the leaf of 'Sunny Knock Out' has weak glossiness. The colour of the flower bud of 'Chewhocan' is yellow while it is lighter yellow with an orange red to light red pink apex for 'Scrivjean' and yellow orange for 'Sunny Knock Out'. The flower colour group of 'Chewhocan' is yellow while for 'Scrivjean' it is a light yellow with a pink blend. The flower of 'Chewhocan' is smaller in diameter than the flower of 'Scrivjean' and 'Sunny Knock Out'. The petal size for 'Chewhocan' is smaller than that of 'Sunny Knock Out'. The inner side of the petal of 'Chewhocan' has one colour whereas the petal of 'Scrivjean' has two colours. The intensity of the colour on the inner side of the petal of 'Chewhocan' is evenly distributed whereas the colour fades towards the apex for 'Sunny Knock Out'. The colour of the inner side of the petal for 'Chewhocan' is yellow whereas it is light red pink with light blue pink tones for 'Scrivjean' and yellow green with yellow to light yellow towards the base for 'Sunny Knock Out'.


PLANT: shrub type, semi upright growth habit
YOUNG SHOOT: no anthocyanin colouration
STEM: medium number of predominantly greenish prickles

PETIOLE: weak intensity of anthocyanin colouration when leaf is newly open
LEAF: medium green on upper side, medium glossiness on upper side, no anthocyanin colouration on upper side, absent to weak undulation of leaflet margin
TERMINAL LEAFLET: medium elliptic, acute base, acuminate apex

SEPAL: weak extensions
FLOWER BUD: medium ovate in longitudinal section, yellow (RHS 9B)
FLOWER: semi-double type, irregularly rounded when viewed from above, flattened convex upper part and flat lower part when viewed from the side, yellow colour group, weak fragrance, loose density of petals, no reflexing of petals one by one
PETAL: obovate, absent or very weak incisions, absent to weak reflexing of margin, absent to weak undulation, one colour on inner side, evenly distributed intensity of yellow (RHS 8A) on inner side, no basal spot on inner side
FILAMENT: predominantly medium yellow

Origin & Breeding History: 'Chewhocan' was bred and developed by Christopher Hugh Warner in Newport, Shropshire, United Kingdom. It originated from a controlled cross conducted in June 2000 between the variety 'Horcoherent' as the female parent and 'Chewpatel' as the male parent. 'Chewhocan' was selected in 2005 based on growth habit, disease resistance, glossy foliage, free flowering habit, number of flowers, abundant and attractive flowers, and flower colour. Asexual reproduction of 'Chewhocan' was first conducted by softwood cuttings in 2005 in Newport, Shropshire, United Kingdom.

Tests & Trials: The comparative trial for 'Chewhocan' was conducted outdoors during the summer of 2014 at BioFlora Inc. in St. Thomas, Ontario. The trial included a total of 10 plants each of the candidate and reference varieties. All plants were grown from liners transplanted into 9 litre pots in July of 2013. Observations and measurements were taken from 10 plants or parts of plants of each variety on July 21, 2014. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Chewhocan' with reference varieties 'Scrivjean' and 'Sunny Knock Out'

Plant height (cm)

  'Chewhocan' 'Scrivjean' 'Sunny Knock Out'
mean 34.7 18.0 46.6
std. deviation 5.91 2.94 4.50

Leaf length (cm)

  'Chewhocan' 'Scrivjean' 'Sunny Knock Out'
mean 7.4 6.7 11.6
std. deviation 0.78 0.71 0.72

Leaf width (cm)

  'Chewhocan' 'Scrivjean' 'Sunny Knock Out'
mean 4.8 4.1 8.7
std. deviation 0.60 0.52 1.23

Colour of flower bud (RHS)

  'Chewhocan' 'Scrivjean' 'Sunny Knock Out'
outer side 9B 12B-C with 39B-C at apex more orange than 13B

Number of petals

  'Chewhocan' 'Scrivjean' 'Sunny Knock Out'
mean 15.2 19.0 9.2
std. deviation 1.92 2.55 2.17

Flower diameter (cm)

  'Chewhocan' 'Scrivjean' 'Sunny Knock Out'
mean 3.9 4.5 6.1
std. deviation 0.37 0.38 0.73

Petal length (cm)

  'Chewhocan' 'Scrivjean' 'Sunny Knock Out'
mean 2.0 2.0 3.6
std. deviation 0.14 0.30 0.16

Petal width (cm)

  'Chewhocan' 'Scrivjean' 'Sunny Knock Out'
mean 1.5 1.5 3.0
std. deviation 0.20 0.31 0.35

Colour of inner side of petal (RHS)

  'Chewhocan' 'Scrivjean' 'Sunny Knock Out'
main 8A 36A with 65B-C tones 2D with 5C-D at base
secondary N/A 4D N/A

Click on image for larger view
Rose: 'Chewhocan' (left) with reference varieties 'Scrivjean' (centre) and 'Sunny Knock Out' (right)

Click on image for larger view
Rose: 'Chewhocan' (left) with reference varieties 'Scrivjean' (centre) and 'Sunny Knock Out' (right)

Click on image for larger view
Rose: 'Chewhocan' (left) with reference varieties 'Scrivjean' (centre) and 'Sunny Knock Out' (right)

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