Agrihydrazeven

Hydrangea

Denomination: 'Agrihydrazeven'
Previously Proposed Denomination: 'Hycawhis'
Trade name: White Spirit
Botanical Name: Hydrangea macrophylla
Applicant/Holder: Hydrangea Breeders Association B.V.
Achterweg 58a
1424 PR
De Kwakel
Netherlands
Breeder: Niels Arts, Aalsmeer, Netherlands
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Canada
Tel: 519-631-6241
Application Date: 2011-10-14
Application Number: 11-7402

Variety Description

Variety used for comparison: 'White Delight'

Summary: The natural plant height (including the inflorescence) of the plants of 'Agrihydrazeven' is taller than the natural plant height of 'White Delight'. The inflorescence of 'Agrihydrazeven' is shorter and larger in diameter than the inflorescence of 'White Delight'. The sepal of the sterile flower of 'Agrihydrazeven' is more narrow than the sepal of the sterile flower of 'White Delight'. When aged, the inner side of the sepal of the sterile flower of 'Agrihydazeven' is white with a blue pink overcolour whereas the inner side of the sepal of the sterile flower of 'White Delight' is white.

Description:

PLANT: non-climbing type, upright growth habit
STEM: no fasciation, green, medium number of lenticels in autumn, black lenticels

LEAF BLADE: no lobing, elliptic to circular shape, medium length of tip, rounded base, medium depth of incisions of margin, no variegation, dark green upper side, medium degree of glossiness of upper side, medium degree of blistering

FLOWERING: begins very early
INFLORESCENCE: flattened to globular shape, inconspicuous or slightly conspicuous fertile flowers
STERILE FLOWER: single type, medium degree of overlapping of sepals, incisions of margin present on some sepals
SEPAL OF STERILE FLOWER (INNER SIDE): yellow green (RHS 150D) with light green (RHS N144D) tones when newly open, white (RHS NN155B) with yellow green (RHS 150D) tones when fully open, white (RHS NN155B) with blue pink (RHS 68B-C) overcolour when aged, no secondary colour
PETAL OF FERTILE FLOWER: inner side is green changing to pink with age

Origin & Breeding History: 'Agrihydrazeven' was bred and developed by the breeder, Niels Arts, in Aalsmeer, Netherlands. It originated from a cross conducted on May 15, 2007, in De Kwakel, Netherlands, between the female parent designated '20141-01', and the male parent designated '200197-01'. From the resulting progeny, 'Agrihydrazeven' was selected on April 25, 2009, in Glandorf, Germany, for its inflorescence colour, branching habit, and overall plant growth habit. 'Agrihydrazeven' was first asexually propagated by cuttings on April 20, 2010, in Glandorf, Germany.

Tests & Trials: The comparative trial for 'Agrihydrazeven' was conducted in a polyhouse during the spring of 2016, at BioFlora Inc., in St. Thomas, Ontario. The trial included 8 shrubs each of the candidate and reference variety. All shrubs were grown from pre-finished plants obtained from cuttings that were rooted in 2015, and planted in 10 cm pots. The observations and measurements were taken from 8 plants or 10 parts of 8 plants of each variety on June 2, 2016. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.


Comparison tables for 'Agrihydrazeven' with reference variety 'White Delight'

Natural plant height (including inflorescence) (cm)

  'Agrihydrazeven' 'White Delight'
mean 52.1 37.3
std. deviation 2.62 1.65

Inflorescence height (cm)

  'Agrihydrazeven' 'White Delight'
mean 5.9 10.0
std. deviation 0.72 1.11

Inflorescence diameter (cm)

  'Agrihydrazeven' 'White Delight'
mean 20.1 16.8
std. deviation 1.32 0.54

Width of sepal of sterile flower (cm)

  'Agrihydrazeven' 'White Delight'
mean 3.9 4.6
std. deviation 0.30 0.20

Colour of inner side of sepal of sterile flower (RHS)

  'Agrihydrazeven' 'White Delight'
aged NN155B with 68B-C overcolour NN155C

Click on image for larger view
Agrihydrazeven
Hydrangea: 'Agrihydrazeven' (left) with reference variety 'White Delight' (right)

Click on image for larger view
Agrihydrazeven
Hydrangea: 'Agrihydrazeven' (left) with reference variety 'White Delight' (right)

Click on image for larger view
Agrihydrazeven
Hydrangea: 'Agrihydrazeven' (left) with reference variety 'White Delight' (right)

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