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Zlepoltwo

Rose

Denomination: 'Zlepoltwo'
Trade name: Pretty Polly White
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: 19-9895

Variety Description

Variety used for comparison: 'Seafoam'

Summary: The plant growth habit of 'Zlepoltwo' is upright to semi-upright while that of 'Seafoam' is moderately spreading. During the second flush, the plants of 'Zlepoltwo' are taller than those of 'Seafoam'. The entire leaflet and terminal leaf of 'Zlepoltwo' are longer than those of 'Seafoam'. The glossiness of the upper side of the leaf of 'Zlepoltwo' is weak to medium while it is medium to strong for that of 'Seafoam'. The flower diameter and petal of 'Zlepolone' are smaller than that of 'Seafoam'. The flower shape of 'Zlepoltwo' is round while it is irregularly rounded for 'Seafoam'. The sepal extensions on the flower of 'Zlepoltwo' are medium to strong while they are absent or very weak to weak for 'Seafoam'.

Description:

PLANT: shrub type, upright to semi-upright growth habit, very weak intensity of anthocyanin colouration present on upper third of young shoot, absent or very few prickles on stem

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

FLOWERING SHOOT: few to medium number of flowering laterals, medium number of flowers per lateral
FLOWER BUD: broad ovate
FLOWER: double type, white colour group, medium to medium dense petals, round shape, flat profile of upper part, flattened convex profile of lower part, medium fragrance, medium to strong sepal extensions
PETAL: no reflexing of petals one-by-one, obovate shape, no incisions, absent or very weak to weak reflexing of margin, absent or very weak undulation, one colour on inner side (basal spot excluded), inner side white (RHS NN155C), outer side white (RHS NN155D)
OUTER STAMEN: predominantly light to medium yellow filament

Origin & Breeding History: The variety 'Zlepoltwo' originated from a controlled cross conducted by the breeder, David Zlesak, of River Falls, Wisconsin, USA. The cross was made in June 1998 in Rhinelander, Wisconsin, USA between two unnamed proprietary parents. From the resulting progeny, the new variety was selected as a single plant based on its vigorous growth, foliage, double white coloured flowers and disease resistance. Asexual reproduction of 'Zlepoltwo' was first conducted by vegetative cuttings in West Grove, Pennsylvania, USA.

Tests & Trials: The comparative trial for 'Zlepoltwo' was conducted outdoors during the summer of 2020 in St. Thomas, Ontario. The trial included 9 plants of the candidate variety and 10 plants of the reference variety. All plants were grown from bare-rooted cuttings and transplanted into 13.6 litre containers in May 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 'Zlepoltwo' with reference variety 'Seafoam'

Plant height during second flush (cm)

  'Zlepoltwo' 'Seafoam'
mean 51.3 39.9
std. deviation 7.94 6.19

Entire leaflet length (cm)

  'Zlepoltwo' 'Seafoam'
mean 10.8 8.8
std. deviation 0.51 0.46

Terminal leaf length (cm)

  'Zlepoltwo' 'Seafoam'
mean 3.8 2.8
std. deviation 0.28 0.22

Flower diameter (cm)

  'Zlepoltwo' 'Seafoam'
mean 2.5 5.9
std. deviation 0.20 0.45

Petal length (cm)

  'Zlepoltwo' 'Seafoam'
mean 1.2 2.8
std. deviation 0.03 0.15

Petal width (cm)

  'Zlepoltwo' 'Seafoam'
mean 0.84 2.1
std. deviation 0.07 0.11

Click on image for larger view
Zlepoltwo
Rose: 'Zlepoltwo' (left) with reference variety 'Seafoam' (right)

Click on image for larger view
Zlepoltwo
Rose: 'Zlepoltwo' (left) with reference variety 'Seafoam' (right)

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