Denomination: 'Nimbus'
Trade name: Show Off Sugar Baby
Botanical Name: Forsythia ×intermedia
Applicant/Holder: Hortival Diffusion SAS
Les Fontaines de l'Aunay
Breeder: Patrick Pineau, Pépinières Minier SA, Beaufort-en-Vallée, France
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-631-6241
Application Date: 2011-08-19
Application Number: 11-7352
Grant of Rights Date: 2013-08-19
Certificate Number: 4608
Grant of Rights Termination Date: 2031-08-19

Variety Description

Variety used for comparison: 'Courdijau' (Golden Peep)

Summary: The leaf of 'Nimbus' is wider than the leaf of 'Courdijau'. The flower of 'Nimbus' is larger in diameter than the flower of 'Courdijau'. There are three flowers per node for 'Nimbus' while the flowers of 'Courdijau' are solitary. The flower attitude is mainly horizontal for 'Nimbus' while it is drooping for 'Courdijau'. The petal of 'Nimbus' is longer than the petal of 'Courdijau'. The upper side of the petal of 'Nimbus' is yellow while the upper side of the petal of 'Courdijau' is a slightly darker yellow. The style in the flower of 'Nimbus' is shorter when compared to the anthers while the style in the flower of 'Courdijau' is longer than the anthers.


PLANT: weak to medium vigour, upright habit, one year old lateral shoot light brown in colour

LEAF: narrow elliptic, cuneate base, serrulate incisions on terminal third of margin, light green in summer, purple in fall, no variegation

FLOWER: early flowering, three flowers per node, mostly horizontal attitude, large, style shorter than anthers
PETALS: open to wide open, elliptic, yellow (RHS 5A to 6B), veins yellow
PEDICEL: short
SEPALS: green with some red colouration.

Origin & Breeding History: The variety 'Nimbus' originated from an open pollination that occurred in La Méntiré, France in 2004. The female parent was the Forsythia x intermedia variety 'Courdijau' and the male parent was unknown. The new variety was selected as a single plant in 2006 based on characteristics that included having a dwarf upright plant habit, compact and well branched plant growth, abundant and dense flowers, extended flowering period, curly petals, bright yellow flower colour, good weather resistance and good disease resistance. The first asexual propagation by softwood cuttings was conducted in May 2006 in La Méntiré, France.

Tests & Trials: Trials for 'Nimbus' were conducted in an outdoor container trial during the spring/summer of 2012 in St. Thomas, Ontario. The trial included a total of 15 plants each of the candidate and reference variety. All plants were grown from quick turn liners and planted into 13.2 litre containers in June 2011. The plants were overwintered in a polyhouse and moved outdoors in April 2012. Observations and measurements on the flowers were taken from 10 plants of each variety on March 4, 2012. Observations and measurements on the remaining characteristics were taken on June 4, 2012. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Nimbus' with reference variety 'Courdijau'

Leaf width (cm)

  'Nimbus' 'Courdijau'
mean 2.8 2.0
std. deviation 0.10 0.20

Flower diameter (cm)

  'Nimbus' 'Courdijau'
mean 2.5 2.1
std. deviation 0.24 0.29

Petal length (cm)

  'Nimbus' 'Courdijau'
mean 2.0 1.7
std. deviation 0.15 0.18

Colour of petal (RHS)

  'Nimbus' 'Courdijau'
upper side 5A, 6B 7A-B

Click on image for larger view
Forsythia: 'Nimbus' (left) with reference variety 'Courdijau' (right)

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