Blue Chip Jr

Butterfly Bush

Denomination: 'Blue Chip Jr'
Botanical Name: Buddleja
Applicant/Holder: North Carolina State University
Office of Technology Transfer
1021 Main Campus Drive
Raleigh, North Carolina
United States of America
Breeder: Dennis J. Werner, North Carolina State University, Raleigh, United States of America
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-631-6241
Application Date: 2013-08-19
Application Number: 13-8095

Variety Description

Variety used for comparison: 'Blue Chip'

Summary: The plants and leaf blade of 'Blue Chip Jr' are shorter than those of 'Blue Chip'. The margin of the leaf blade of 'Blue Chip Jr' is entire and weakly dentate whereas the margin of 'Blue Chip' is dentate. The inflorescence of 'Blue Chip Jr' is narrower than that of 'Blue Chip'. The inflorescence of 'Blue Chip Jr' has medium flower density whereas the inflorescence of 'Blue Chip' has dense flowers.


PLANT: semi-upright to spreading growth habit, broader than tall, flowering begins mid-season
STEM: green and reddish, strongly angular in cross-section, very dense pubescence

LEAF BLADE: medium ovate and elliptic, medium green on upper side, no variegation, entire and weakly dentate margin, sparse pubescence on upper side, strong pubescence on lower side, medium degree of bulging between veins

INFLORESCENCE: cylindrical, medium density of flowers
CALYX: short, dense pubescence
COROLLA LOBE: erect attitude at full flowering, free to touching arrangement, medium depth margin incisions, inner side violet (RHS N81B) with blue violet (RHS 86C) along the margin, outer side violet (RHS N81B) with blue violet (closest to RHS 86C) along margin, orange eye with a yellowish white margin
COROLLA TUBE: inner side violet (lighter than RHS N77B)

Origin & Breeding History: 'Blue Chip Jr' originated from a controlled cross conducted at North Carolina State University in Raleigh, North Carolina, USA, in July 2008. The cross was made between the female parent variety 'Blue Chip' and the male parent designated NC2006-18 (NC2003-16 x 'Miss Molly'). The new variety was selected on August 14, 2009 in Jackson Springs, North Carolina based on its growth habit, branch strength, flower colour, foliage colour, female sterility and cold temperature hardiness. Asexual propagation by softwood and semi-hardwood stem cuttings of 'Blue Chip Jr' was first conducted on October 7, 2009 in Raleigh, North Carolina, USA.

Tests & Trials: The comparative trial for 'Blue Chip Jr' was conducted in an outdoor irrigated container trial during the spring and summer of 2016, at Bioflora Inc., in St. Thomas, Ontario. The trial included a total of 12 plants each of the candidate and reference variety. All plants were grown from 10 cm rooted liners and transplanted into 9 litre containers on July 6, 2015. Observations and measurements were taken from 10 plants of each variety on August 4, 2016. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Blue Chip Jr' with reference variety 'Blue Chip'

Plant height (cm)

  'Blue Chip Jr' 'Blue Chip'
mean 38.5 56.1
std. deviation 2.72 1.77

Leaf blade length (cm)

  'Blue Chip Jr' 'Blue Chip'
mean 5.1 7.9
std. deviation 0.44 0.60

Inflorescence width (cm)

  'Blue Chip Jr' 'Blue Chip'
mean 2.1 3.1
std. deviation 0.23 0.27

Click on image for larger view
Blue Chip Jr
Butterfly Bush: 'Blue Chip Jr' (left) with reference variety 'Blue Chip' (right)

Click on image for larger view
Blue Chip Jr
Butterfly Bush: 'Blue Chip Jr' (left) with reference variety 'Blue Chip' (right)

Click on image for larger view
Blue Chip Jr
Butterfly Bush: 'Blue Chip Jr' (left) with reference variety 'Blue Chip' (right)

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