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Rockrose

Saxifrage

Denomination: 'Rockrose'
Trade name: Touran Neon Rose
Botanical Name: Saxifraga ×arendsii
Applicant/Holder: Syngenta Crop Protection AG
Schwarzwaldallee 215
Basel
4058
Switzerland
Breeder: M. Gutter, Enkhuizen, Netherlands
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Canada
Tel: 519-317-7511
Application Date: 2007-02-19
Application Number: 07-5738
Grant of Rights Date: 2012-06-22
Certificate Number: 4340
Date rights surrendered: 2014-06-22

Variety Description

Varieties used for comparison: 'PeterPan Red' and 'Purple Robe'

Summary: The leaf blade of 'Rockrose' is longer and wider than the leaf blade of 'Peterpan Red' and shorter and narrower than the leaf blade of 'Purple Robe'. The flowering stem of 'Rockrose' has medium anthocyanin colouration while the flowering stem of 'Peterpan Red' has absent or very weak anthocyanin and the flowering stem of 'Purple Robe' has weak anthocyanin. The plants of 'Rockrose' flower very early while the reference varieties flower early in the season. The flower of 'Rockrose' has a larger diameter than the flower of 'PeterPan Red'. The upper side of the newly opened flower of 'Rockrose' is purple red while the flowers of the reference varieties are dark purple red. The upper side of the fully opened flower of 'Rockrose' is blue pink while it is purple red for 'PeterPan Red' and purple for 'Purple Robe'. The upper side of the aged flower is violet for 'Rockrose' while it is white and blue pink for 'PeterPan Red' and brown purple for 'Purple Robe'.

Description:

PLANT: erect growth habit, many flowering stems, dense foliage

LEAF: alternate arrangement, simple, elliptic to obovate shape, apex with 3-5 deep lobes, attenuate base, upper side light green, no petiole

INFLORESCENCE: flowering stem light green with medium anthocyanin colouration, cymose panicle, very early flowering
FLOWERS: upper side purple red (RHS 63A) with dark red purple (RHS 53A) veins when newly opened, blue pink (RHS N66C-D) with purple red (RHS 63A) veins when fully opened, violet (RHS 75B-C) with dark purple red to blue pink (RHS 63A-B) veins when mature to aged
PETAL: broad elliptic shape, broad acute to rounded apex, apex with weak reflexing
ANTHER: yellow before dehiscence, yellow to orange after dehiscence
FILAMENT: green

Origin & Breeding History: The variety 'Rockrose' was selected as a rose coloured flowering seedling, designated as D652, which originated from three cycles of halfsib selection from the Saxifraga x arendsii variety 'Blutenteppich'. The selection cycles were conducted during the period starting in April 2001 through to March 2003 in Enkhuizen, the Netherlands. The variety was selected in March 2003 based on criteria for early spring flowering, strong compact plant habit, free flowering and rose flower colour. The variety has been reproduced by cuttings in Enkhuizen, the Netherlands since March 2003.

Tests & Trials: Trials for 'Rockrose' were conducted in a polyhouse during the spring of 2011 in St. Thomas, Ontario. Trials included 15 plants each of the candidate and reference varieties. Rooted cuttings were transplanted into 11 cm pots in September 2010. Observations and measurements were taken from 10 plants of the candidate variety on April 19, 2011 and on the reference varieties on May 4, 2011. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.


Comparison tables for 'Rockrose' with reference varieties 'PeterPan Red' and 'Purple Robe'

Leaf blade length (mm)

  'Rockrose' 'PeterPan Red' 'Purple Robe'
mean 10.7 6.4 15.0
std. deviation 0.87 0.73 1.05

Leaf blade width (mm)

  'Rockrose' 'PeterPan Red' 'Purple Robe'
mean 6.1 2.1 13.8
std. deviation 0.74 0.32 3.01

Flower diameter (mm)

  'Rockrose' 'PeterPan Red' 'Purple Robe'
mean 19.0 12.7 17.3
std. deviation 0.94 1.49 0.82

Colour of upper side of petal (RHS)

  'Rockrose' 'PeterPan Red' 'Purple Robe'
newly opened 63A with 53A veins 60B 53A
fully opened N66C-D with 63A veins 60D with 60B veins 60C with 53A veins
aged 75B-C with 63A-B veins NN155C at base, 186C towards margin 186A, 186B-C towards margin

Click on image for larger view
Rockrose
Saxifrage: 'Rockrose' (left) with reference varieties 'PeterPan Red' (centre) and 'Purple Robe' (right)

Click on image for larger view
Rockrose
Saxifrage: 'Rockrose' (left) with reference varieties 'PeterPan Red' (centre) and 'Purple Robe' (right)

Click on image for larger view
Rockrose
Saxifrage: 'Rockrose' (left) with reference varieties 'PeterPan Red' (centre) and 'Purple Robe' (right)

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