Denomination: 'Kiedahsuy'
Botanical Name: Dahlia ×hortensis
Applicant/Holder: Kieft Bloemzaden B.V.
Elbaweg 35
1607 MN
Breeder: Cees Van Diepen, Kieft Bloemzaden B.V., Venhuizen, Netherlands
Agent in Canada: Variety Rights Management
475 County Road 18
R.R. #2
Oxford Station, Ontario
K0G 1T0
Tel: 613-258-9015
Application Date: 2004-02-20
Application Number: 04-4051
Date abandoned: 2008-11-06

Variety Description

Variety used for comparison: 'Margaret Improved'

Summary: Dahlia variety 'Kiedahsuy' has smaller leaves and smaller and shallower flowers than variety 'Margaret Improved'. The ray florets of 'Kiedahsuy' are smaller than those of 'Margaret Improved', and have a pointed tip, whereas those of 'Margaret Improved' have a blunt tip. 'Kiedahsuy' has more involucral bracts than 'Margaret Improved'. The bracts of 'Kiedahsuy' are elliptical, whereas those of 'Margaret Improved' are rhomboidal.


PLANT: upright habit
STEM: medium green, no anthocyanin colouration, straight, absent or very sparse pubescence

LEAF: simple and compound types, ovate, denticulate to dentate margin, moderately leathery, weak glaucosity and absent or very sparse pubescence on upper surface, medium to dark green, no wings and no anthocyanin colouration on petiole

FLOWER: semi-double type, above and in the foliage, angle with stem is 30 to 60 , yellow monocolour
RAY FLORET: yellow to yellow green on upper side, yellow green on lower side, no markings, pointed tip, presence of disc floret
BRACTS: elliptical, yellowish in colour

Origin & Breeding History: 'Kiedahsuy' was developed from a cross between line 98-1833 and a compact yellow multiflora type line named 98-3426 made in 1999 at Venhuizen, The Netherlands. The F1 seedlings were grown in 2000 and several clones, one of which being variety 'Kiedahsuy', were selected from 2000 to 2003. Selection criteria were plant habit, flower shape, flower colour, vigor, health, reliable propagation and cutting stability.

Tests & Trials: Trials for 'Kiedahsuy' were conducted during the summer of 2006 in Oxford Station, Ontario. Trials consisted of 15 plants of each variety grown in 10 cm pots in a polyhouse. Plants were spaced 15 cm apart. Observations and measurements were taken from 10 plants of each variety. All colour measurements were made using the 2001 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Kiedahsuy' with reference variety 'Margaret Improved'

Leaf length (cm)

  'Kiedahsuy' 'Margaret Improved'
mean 3.4 4.3
std. deviation 0.29 0.38

Leaf width (cm)

  'Kiedahsuy' 'Margaret Improved'
mean 2.1 2.8
std. deviation 0.39 0.24

Flower diameter (cm)

  'Kiedahsuy' 'Margaret Improved'
mean 4.2 5.3
std. deviation 0.34 0.42

Flower depth (cm)

  'Kiedahsuy' 'Margaret Improved'
mean 1.8 2.4
std. deviation 0.23 0.48

Ray floret length (mm)

  'Kiedahsuy' 'Margaret Improved'
mean 20.6 27.2
std. deviation 2.25 2.54

Ray floret width (mm)

  'Kiedahsuy' 'Margaret Improved'
mean 9.1 15.1
std. deviation 1.66 2.88

Number of involucral bracts (count)

  'Kiedahsuy' 'Margaret Improved'
mean 17.9 8.6
std. deviation 3.26 0.92

Colour of ray florets (RHS)

  'Kiedahsuy' 'Margaret Improved'
upper side 4B/C 2A/B
lower side 4C 2C

Click on image for larger view
Dahlia: 'Kiedahsuy' (left) with reference variety 'Margaret Improved' (right)

Date modified: