Denomination: 'Heliosil'
Trade name: Scentropia Silver
Botanical Name: Heliotropium arborescens
Applicant/Holder: Syngenta Crop Protection AG
Schwarzwaldallee 215
Breeder: Ánna M.W.P. Houbraken, Syngenta Seeds B.V., Enkhuizen, Netherlands
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-631-6241
Application Date: 2005-11-25
Application Number: 06-5657
Grant of Rights Date: 2009-09-23
Certificate Number: 3619
Date rights surrendered: 2012-10-12

Variety Description

Varieties used for comparison: 'KLEHA07522' and 'Heliovi'

Summary: 'Heliosil' has a less upright growth habit than 'KLEHA07522'. 'Heliosil' has a taller plant height than the reference varieties. 'Heliosil' has a longer peduncle length than 'Heliovi' and shorter peduncle length than 'KLEHA07522'. The upper side of the corolla is white and light blue violet for 'Heliosil' while it is white with a weak violet blush for 'KLEHA07522' and violet for 'Heliovi'.


PLANT: bushy-rounded growth habit, medium degree of branching
STEM: light green, no anthocyanin colouration, dense pubescence, medium thickness, smooth

LEAF: alternate arrangement, simple, ovate, acute apex, cuneate base, entire margin, medium pubescence on upper and lower side, light to medium green on upper and lower side

PEDUNCLE: no anthocyanin colouration, medium pubescence

INFLORESCENCE: cyme, terminal position, erect to semi-erect, dense
COROLLA LOBES: 5, petals partially fused, medium size, salverform, weak undulation of margin, absent to very weak recurvature of margin, medium pubescence on throat, light blue violet on upper side with white at base, throat yellow green, light blue violet on lower side

Origin & Breeding History: 'Heliosil' originated from a controlled cross made in August 2001, in Enkhuizen, The Netherlands. The female parent was identified as A0260-1 and the pollen came from unidentified Heliotropium arborescens plants. The new variety was selected as a single seedling in August 2002, based on criteria for growth and branching habit, flower head size and good heat tolerance. Asexual reproduction by cuttings was first conducted in August 2002 in Enkhuizen, The Netherlands.

Tests & Trials: Trials for 'Heliosil' were conducted during the summer of 2008 in a polyhouse at BioFlora Inc. in St. Thomas, Ontario. There were 15 plants each of the candidate and reference variety. The plants were grown from rooted cuttings which were transplanted into 15 cm pots on April 30, 2008. Observations and measurements were taken from 10 plants on June 16, 2008. All colour determinations were made using the 2001 Royal Horticulture Society (RHS) Colour Chart.

Comparison tables for 'Heliosil' with reference varieties 'KLEHA07522' and 'Heliovi'

Plant height (cm)

  'Heliosil' 'KLEHA07522' 'Heliovi'
mean 34.1 29.0 19.9
std. deviation 2.02 1.89 2.13

Plant width (cm)

  'Heliosil' 'KLEHA07522' 'Heliovi'
mean 40.6 38.7 28.0
std. deviation 4.53 2.95 2.67

Inflorescence diameter (cm)

  'Heliosil' 'KLEHA07522' 'Heliovi'
mean 11.1 16.3 14.0
std. deviation 0.66 1.57 2.03

Corolla colour (RHS)

  'Heliosil' 'KLEHA07522' 'Heliovi'
upper side 85D white with weak violet blush N87A (newly opened), N82C (fully opened)
lower side 85D white N87C (newly opened), 76D (fully opened)
throat 1B 1B 144A

Click on image for larger view
Heliotrope: 'Heliosil' (left) with reference varieties 'KLEHA07522' (centre) and 'Heliovi' (right)

Click on image for larger view
Heliotrope: 'Heliosil' (left) with reference varieties 'KLEHA07522' (centre) and 'Heliovi' (right)

Click on image for larger view
Heliotrope: 'Heliosil' (left) with reference varieties 'KLEHA07522' (centre) and 'Heliovi' (right)

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