Zlepolone

Rose

Denomination:	'Zlepolone'
Trade name:	Pretty Polly Pink
Botanical Name:	Rosa
Applicant/Holder:	The Conard-Pyle Company 8 Federal Road, Suit 6 West Grove, Pennsylvania 19390 United States of America
Breeder:	David Zlesak, St. Paul, United States of America
Agent in Canada:	BioFlora Inc. 38723 Fingal Line R.R. #1 St. Thomas, Ontario N5P 3S5 Canada Tel: 519-317-7511
Application Date:	2019-05-17
Provisional Protection::	2019-05-17
Application Number:	19-9894
Grant of Rights Date:	2022-05-03
Certificate Number:	6574
Grant of Rights Termination Date:	2042-05-03

Variety Description

Varieties used for comparison: 'The Fairy' and 'Zlepolthree' (Pretty Polly Lavender)

Summary: During the second flush, the plants of 'Zlepolone' are shorter than those of both reference varieties. The terminal leaf of 'Zlepolone' is larger than that of 'The Fairy'. The glossiness of the upper side of the leaf of 'Zlepolone' is weak while it is medium to strong for that of 'The Fairy' and absent or very weak for that of 'Zlepolthree'. The flower of 'Zlepolone' has fewer petals than that of 'Zlepolthree'. The flower diameter and petal of 'Zlepolone' are smaller than that of 'The Fairy'. When fully opened, the inner side of the petal of 'Zlepolone' is purple to blue pink changing to purple red with age while the inner side of the petal of 'The Fairy' is light blue pink and that of 'Zlepolthree' is blue pink changing to violet with light blue violet and white towards the base with age. The outer side of the petal of 'Zlepolone' is purple red while the outer side of the petal of 'The Fairy' is blue pink to light blue pink and that of 'Zlepolthree' is light blue violet.

Description:

PLANT: shrub type, semi-upright growth habit, medium intensity of anthocyanin colouration on young shoot, few yellowish prickles on stem

YOUNG LEAFLET: absent or very weak intensity of anthocyanin colouration
LEAF: small to medium sized, upper side light to medium green, no anthocyanin colouration, weak glossiness of upper side, absent or very weak undulation of margin
TERMINAL LEAFLET: medium elliptic shape, obtuse base, acuminate to acute apex

FLOWERING SHOOT: medium number of flowering laterals, many flowers per lateral
FLOWER BUD: narrow to medium ovate
FLOWER: double type, pink colour group, medium density of petals, round shape, flat to flattened convex profile of upper part, flattened convex profile of lower part, absent or weak to medium fragrance, weak to medium sepal extensions
PETAL: reflexing of petals one-by-one present, obovate shape, weak to medium incisions, weak to medium reflexing of margin, weak to medium undulation, one colour on inner side (basal spot excluded), when fully opened main colour purple to blue pink (RHS 67A-B), when aged main colour purple red (RHS N57C-D), outer side purple red (RHS N57C-D)
BASAL PETAL SPOT (INNER SIDE): small to medium sized, white
OUTER STAMEN: predominantly medium yellow filament

Origin & Breeding History: The variety 'Zlepolone' originated from a controlled cross conducted by the breeder, David Zlesak, of River Falls, Wisconsin, USA. The cross was made in June 2007 in Minnesota, USA between the female parent variety 'BAlpome' and the male parent variety 'Mountain Mignonette'. From the resulting progeny, the new variety was selected as a single plant based on its compact plant growth habit, branching characteristics, double deep purple-pink coloured flowers and disease resistance. Asexual reproduction of 'Zlepolone' was first conducted by vegetative cuttings in West Grove, Pennsylvania, USA.

Tests & Trials: The comparative trial for 'Zlepolone' was conducted outdoors during the summer of 2020 in St. Thomas, Ontario. The trial included 9 plants each of the candidate variety and 'Zlepolthree' and 10 plants of 'The Fairy'. All plants were grown from bare-root cuttings and transplanted into 13.6 litre containers in June 2020. Observations and measurements were taken from 10 plants, or 10 parts of plants, of each variety on July 23, 2020. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Zlepolone' with reference varieties 'The Fairy' and 'Zlepolthree'

Plant height during second flush (cm)

	'Zlepolone'	'The Fairy'	'Zlepolthree'
mean	31.0	35.2	35.4
std. deviation	6.03	3.95	3.71

Terminal leaf length (cm)

	'Zlepolone'	'The Fairy'	'Zlepolthree'
mean	3.7	2.5	3.9
std. deviation	0.34	0.26	0.58

Terminal leaf width (cm)

	'Zlepolone'	'The Fairy'	'Zlepolthree'
mean	2.0	1.6	2.3
std. deviation	0.14	0.24	0.33

Petals per flower (number)

	'Zlepolone'	'The Fairy'	'Zlepolthree'
mean	26	29	45
std. deviation	3.51	4.94	5.40

Flower diameter (cm)

	'Zlepolone'	'The Fairy'	'Zlepolthree'
mean	2.4	3.5	2.5
std. deviation	0.24	0.17	0.22

Petal length (cm)

	'Zlepolone'	'The Fairy'	'Zlepolthree'
mean	1.1	1.7	1.3
std. deviation	0.05	0.08	0.10

Petal width (cm)

	'Zlepolone'	'The Fairy'	'Zlepolthree'
mean	1.1	1.6	0.8
std. deviation	0.07	0.04	0.07

Main colour of petal (RHS)

	'Zlepolone'	'The Fairy'	'Zlepolthree'
inner side- fully opened	67A-B	62B-C	lighter than N74D
inner side- aged	N57C-D	N/A	75B fading to 76D and NN155D at base
outer side	N57C-D	62A-B	75B