Center Glow


Denomination: 'Center Glow'
Botanical Name: Physocarpus opulifolius
Applicant/Holder: Regents of the University of Minnesota
200 Oak Street
360 McNamara Alumni Center
Minneapolis, Minnesota
United States of America
Breeder: Harold Pellet, Landscape Plant Development Center, Mound, United States of America
Agent in Canada: ROBIC
1001 Square Victoria
Bloc E - 8e étage
Montreal, Quebec
H2Z 2B7
Tel: 514-987-2717
Application Date: 2006-02-02
Application Number: 06-5215
Grant of Rights Date: 2014-10-29
Certificate Number: 4944
Grant of Rights Termination Date: 2032-10-29

Variety Description

Varieties used for comparison: 'Coppertina' and 'Monlo' (Diabolo)

Summary: The buds of 'Center Glow' are green whereas they are reddish-purple on both reference varieties. The leaves of 'Center Glow' are longer than those of 'Coppertina' and wider than those of both reference varieties. The leaf margins of 'Center Glow' are serrate whereas they are sinuate on 'Monlo'. At mid-season, the main colour of the upper surface of the leaf of 'Center Glow' is dark violet whereas it is dark brown on 'Coppertina'. There is no secondary colour on the upper surface of the flowers of 'Center Glow' whereas it is light blue pink on 'Coppertina'.


PLANT: oblate shaped shrub, bushy growth habit, medium height, medium branching density, medium growth rate, flowers mid-season

STEM: purple, medium thickness, pubescence absent, angular in cross section, smooth bark, medium glaucosity, absent or very sparse number of lenticels

BUD: small, green, conical shape, pointed apex, absent or very sparse pubescence
BUD SCALE: small, pyramidal shape
LEAF: simple leaf type, opposite in arrangement
LEAF BLADE: ovate, acute apex, cordate base, serrate margin, lobing present, absent or very sparse pubescence, dark violet (RHS 79A) on upper side, young foliage in spring yellow green (RHS 150C)
LOWER SIDE OF LEAF BLADE: brown green (RHS 138A), weak intensity of anthocyanin colouration of the veins
PETIOLE: very strong intensity of anthocyanin colouration

FLOWER: dioecious, corymb, terminal location only, rotate shape, white (RHS 155D) with no secondary colour on upper and lower surfaces, weak fragrance

Origin & Breeding History: 'Center Glow' originated from a cross between 'Monlo' and 'Dart's Gold' made in the summer of 2001 in Mound, Minnesota. It was selected in the spring of 2002 based on the colour of the new foliage in spring. The variety was first propagated by softwood cuttings at the University of Minnesota Horticultural Research Centre, Chaska, Minnesota in the summer of 2002.

Tests & Trials: 'Center Glow’ was tested outdoors at Jeffries Nurseries Limited, Portage La Prairie, Manitoba during the spring of 2013. The plants for testing were started as rooted cuttings in June 2011 and transplanted into 9 litre black plastic containers in May 2012. The trials consisted of 10 plants of each variety. Measured characteristics were based on a minimum of 10 measurements. All colour measurements were made using the 2001 RHS colour chart. Qualitative assessments of spring foliage colour were also performed in April 2010 using 10 plants of each variety planted in 9 litre black plastic containers.

Comparison tables for 'Center Glow' with reference varieties 'Coppertina' and 'Monlo' (Diabolo)

Leaf blade length (cm)

  'Center Glow' 'Coppertina' 'Monlo' (Diabolo)
mean 6.0 5.13 6.23
std. deviation 0.83 0.73 0.74

Leaf blade width (cm)

  'Center Glow' 'Coppertina' 'Monlo' (Diabolo)
mean 4.47 3.55 5.76
std. deviation 0.52 0.55 0.7

Main colour of leaf (RHS)

  'Center Glow' 'Coppertina' 'Monlo' (Diabolo)
upper surface 79A 200A 79B
lower surface 138A 147B 147B

Colour of upper surface of flower (RHS)

  'Center Glow' 'Coppertina' 'Monlo' (Diabolo)
main 155D 155D 155D
secondary colour N/A 62D N/A

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Center Glow
Ninebark: 'Center Glow' (left) with reference varieties 'Coppertina' (centre) and 'Monlo' (Diabolo) (right)

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Center Glow
Ninebark: Candidate variety: 'Center Glow' spring foliage colour

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Center Glow
Ninebark: Reference variety: 'Coppertina' spring foliage colour

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