Denomination: 'Hycativ'
Botanical Name: Hydrangea macrophylla
Applicant/Holder: Hydrangea Breeders Association B.V.
Achterweg 58a
1424 PR
De Kwakel
Breeder: Niels Arts, Aalsmeer, Netherlands
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-631-6241
Application Date: 2006-07-28
Application Number: 06-5564
Grant of Rights Date: 2010-06-01
Certificate Number: 3859
Grant of Rights Termination Date: 2028-06-01

Variety Description

Varieties used for comparison: 'Mars' and 'Doris'

Summary: 'Hycativ' has shorter plants than 'Doris'. The upper side of the large calyx of 'Hycativ' is bicoloured purple with a white margin whereas for 'Mars' it is blue pink with lighter blue pink tones and a light yellow basal spot and for 'Doris' it is purple red aging to blue pink. The sepals of the large calyx of 'Hycativ' have serrate incisions on all sepals while those of the reference varieties have no incisions on all sepals.


PLANT: upright growth habit
STEM: very weak overall with some strong spots of anthocyanin colouration

LEAF BLADE: medium green on upper side, no variegation, medium glossiness on upper side, moderate anthocyanin colouration along margin edge (when present), ranging between elliptic and ovate shape, acuminate apex, ranging between acute and obtuse base, no lobing, medium type incisions of margin
PETIOLE: absent or very weak anthocyanin colouration

INFLORESCENCE: flowers with small calyx are inconspicuous, dome shape
PEDUNCLE: very strong anthocyanin colouration (when present)
LARGE CALYX (STERILE FLOWER): strong to very strong colour intensity, upper side is purple (RHS 58A) with a white (RHS N155D) margin, four sepals per flower, strong overlapping of sepals, serrate incisions of margin present on all sepals

Origin & Breeding History: 'Hycativ' was developed by the breeder, Niels Arts, in Aalsmeer, The Netherlands. The objectives of his breeding program were to create new Hydrangea varieties with bicoloured flowers, strong root systems and strong branching. 'Hycativ' originated from a cross conducted in February 2001 in De Kwakel, The Netherlands between the female parent designated '99110-5' and the male parent designated '99165-3'. Based on its flower colour and strong root system, 'Hycativ' was selected by the breeder in February 2003 in Glandorf, Germany . Asexual reproduction by vegetative cuttings was first conducted in February 2003 in Glandorf, Germany.

Tests & Trials: Trials for 'Hycativ' were conducted in a polyhouse in spring 2009 at BioFlora Inc. in St. Thomas, Ontario. The trial included 10 plants of each variety. All plants were grown from cuttings rooted April 2008 and transplanted into 15 cm pots in May 2008. Observations and measurements were taken from 10 plants or parts of plants of each variety on May 20, 2009. All colour determinations were made using the 2001 Royal Horticultural Society (RHS) Colour charts.

Comparison tables for 'Hycativ' with reference varieties 'Mars' and 'Doris'

Plant height (cm)

  'Hycativ' 'Mars' 'Doris'
mean 23.4 21.4 35.9
std. deviation 2.03 2.20 3.86

Colour of large calyx (RHS)

  'Hycativ' 'Mars' 'Doris'
upper side 58A with N155D margin 63B with 63C tones and 4D basal spot darker and redder than 63A aging to 63B-C

Click on image for larger view
Hydrangea: 'Hycativ' (left) with reference varieties 'Mars' (centre) and 'Doris' (right)

Click on image for larger view
Hydrangea: 'Hycativ' (left) with reference varieties 'Mars' (centre) and 'Doris' (right)

Click on image for larger view
Hydrangea: 'Hycativ' (left) with reference varieties 'Mars' (centre) and 'Doris' (right)

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