Denomination: 'WRHPBB2'
Trade name: Polar Ball
Botanical Name: Hydrangea paniculata
Applicant/Holder: Spring Meadow Nursery, Inc.
12601 120th Avenue
Grand Haven, Michigan
United States of America
Breeder: Catherien Rutten, Leende, Netherlands
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-631-6241
Application Date: 2012-09-20
Application Number: 12-7761
Grant of Rights Date: 2017-01-30
Certificate Number: 5407
Grant of Rights Termination Date: 2037-01-30

Variety Description

Variety used for comparison: 'DVPPinky' (Pinky Winky)

Summary: The plants of 'WRHPBB2' begin flowering early to mid-season whereas the plants of 'DVPPinky' begin flowering mid to late season. The inflorescence of 'WRHPBB2' is smaller than the inflorescence of 'DVPPinky'. The fertile flowers within the inflorescence of 'WRHPBB2' are inconspicuous or slightly conspicuous whereas the fertile flowers of 'DVPPinky' are moderately conspicuous. The calyx of the sterile flower of 'WRHPBB2' is larger in diameter than the calyx of 'DVPPinky'.


PLANT: non-climbing type, upright growth habit
STEM: no fasciation, brownish, white lenticels

LEAF BLADE: no lobing, elliptic shape, short tip, obtuse base, shallow incisions of margin, no variegation, medium to dark green on upper side, absent or very weak glossiness of upper side, medium degree of blistering

FLOWERING: begins early to mid-season
INFLORESCENCE: conical to almost globular shape, inconspicuous or slightly conspicuous fertile flowers
STERILE FLOWER: single type, medium degree of overlapping of sepals, no incisions of margin on all sepals
STERILE FLOWER SEPAL: when flower is newly open main colour of inner side is yellow green (RHS 2D) with darker yellow green (RHS 154D) tones, when flower is fully open main colour of inner side is white (RHS NN155A), no secondary colour on inner side
FERTILE FLOWER: inner side of petal is white

Origin & Breeding History: 'WRHPBB2' was bred and developed by the breeder, Catherien Rutten, of Leende, Netherlands. It originated from an open pollinated cross conducted in the spring of 2005, in Leende, between the Hydrangea paniculata variety 'Barbara', as the female parent, and an unknown male parent. 'WRHPBB2' was selected in the spring of 2008 for its inflorescence form, sepal size, plant vigour, and good production characteristics. Asexual propagation of 'WRHPBB2' by softwood cuttings was first conducted in the spring of 2008, in Leende, Netherlands.

Tests & Trials: The comparative trial of 'WRHPBB2' was conducted in a polyhouse during the spring of 2014 and in 2015 at BioFlora Inc., in St. Thomas, Ontario. It included a total of 8 shrubs each of the candidate and reference variety. All shrubs were grown from rooted cuttings that were each transplanted into a 13.2 litre container on June 19, 2013. The observations and measurements were taken from 10 shrubs, or parts of shrubs, of the candidate and reference variety on July 27, 2015. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'WRHPBB2' with reference variety 'DVPPinky'

Inflorescence length (cm)

  'WRHPBB2' 'DVPPinky'
mean 15.8 36.4
std. deviation 3.15 4.68

Inflorescence width (cm)

  'WRHPBB2' 'DVPPinky'
mean 17.1 22.2
std. deviation 2.45 2.84

Diameter of the calyx of sterile flower (mm)

  'WRHPBB2' 'DVPPinky'
mean 7.2 4.2
std. deviation 0.89 0.50

Click on image for larger view
Hydrangea: 'WRHPBB2' (left) with reference variety 'DVPPinky' (right)

Click on image for larger view
Hydrangea: 'WRHPBB2' (left) with reference variety 'DVPPinky' (right)

Click on image for larger view
Hydrangea: 'WRHPBB2' (left) with reference variety 'DVPPinky' (right)

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