Sweet Summer Love


Denomination: 'Sweet Summer Love'
Botanical Name: Clematis
Applicant/Holder: Spring Meadow Nursery, Inc.
12601 120th Avenue
Grand Haven, Michigan
United States of America
Breeder: Szczepan Marczynski, Pruszków, Poland
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-631-6241
Application Date: 2011-12-14
Application Number: 11-7435
Grant of Rights Date: 2016-08-26
Certificate Number: 5303
Grant of Rights Termination Date: 2036-08-26

Variety Description

Variety used for comparison: 'Abundance'

Summary: The main colour of the upper side of the leaf blade of 'Sweet Summer Love' is medium green whereas it is light green for 'Abundance'. The peduncle length, flower diameter, sepal length and sepal width of 'Sweet Summer Love' are all shorter than those of 'Abundance'.


PLANT: climbing, medium vigour, medium density of pubescence on young shoot

LEAF: pinnate type
TERMINAL LEAFLET: ovate shape, cuspidate apex, obtuse base, entire margin, two or three lobes present, deep sinuses between lobes, medium green on upper side, no variegation, absent or weak rugosity on upper side

FLOWERING: begins flowering mid-season on current season's growth only
FLOWER: clustered arrangement, outwards attitude, single type, rotate shape, concave cross-section in lateral view, weak fragrance
SEPAL: only four per flower, free arrangement, obovate shape, flat to concave in cross-section, moderately reflexed in longitudinal section, type one shape of base, weak undulation of margin, no twisting along longitudinal axis, no petaloid staminodes
SEPAL (INNER SIDE): one colour, dark purple red (RHS 59B) with purple (close to RHS 72A-B) central bar, lighter colour distribution towards middle
SEPAL (OUTER SIDE): brown purple (closest to RHS 186A-B) when fully open with white (RHS 155D) central bar
STAMEN: white filament, purple anther
STIGMA: yellow
STYLE: yellow green

Origin & Breeding History: 'Sweet Summer Love' originated from a cross pollination of two unnamed seedlings conducted by the breeder, Szczepan Marczynski, in Pruszków, Poland in July, 2003. A single seedling was selected from the resultant progeny in 2004 based on its abundant flowering, long flowering period and flower colour. 'Sweet Summer Love' was first propagated asexually by cuttings in June 2004 in Pruszków, Poland.

Tests & Trials: The comparative trial for 'Sweet Summer Love' was conducted in an outdoor trellised trial during the summer of 2015 at BioFlora Inc. in St. Thomas, Ontario. The trial included 8 plants of the candidate variety and 6 plants of the reference variety. All plants were grown from young plants transplanted into 4.4 liter containers on April 3, 2014 and field planted in the fall of 2014. Observations and measurements were taken from 6 plants, or 10 parts of plants, of the reference variety on July 8, 2015 and from 8 plants, or 10 parts of plants, of the candidate variety on July 15, 2015. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Sweet Summer Love' with reference variety 'Abundance'

Peduncle length (cm)

  'Sweet Summer Love' 'Abundance'
mean 3.2 8.4
std. deviation 0.24 1.03

Flower diameter (cm)

  'Sweet Summer Love' 'Abundance'
mean 4.3 6.6
std. deviation 0.42 0.44

Sepal length (cm)

  'Sweet Summer Love' 'Abundance'
mean 2.4 3.4
std. deviation 0.15 0.28

Sepal width (cm)

  'Sweet Summer Love' 'Abundance'
mean 1.2 3.0
std. deviation 0.10 0.28

Click on image for larger view
Sweet Summer Love
Clematis: 'Sweet Summer Love' (left) with reference variety 'Abundance' (right)

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