Denomination: 'NCDX1'
Trade name: Yuki Snowflake
Botanical Name: Deutzia gracilis x Deutzia ×rosea
Applicant/Holder: North Carolina State University
Office of Technology Transfer
1021 Main Campus Drive
Raleigh, North Carolina
United States of America
Breeder: Thomas Green Ranney, North Carolina State University, Arden, 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: 2012-09-12
Application Number: 12-7748
Grant of Rights Date: 2015-06-30
Certificate Number: 5078
Grant of Rights Termination Date: 2035-06-30

Variety Description

Variety used for comparison: 'Nikko'

Summary: The middle of the stem of 'NCDX1' is medium thickness while that of 'Nikko' is thin. The upper calyx of 'NCDX1' has very weak anthocyanin colouration while it is medium to strong for 'Nikko'. The flower of 'NCDX1' has a larger diameter than that of 'Nikko'. The petal of 'NCDX1' is broadly acute and obtuse with medium reflexing of the margin while that of 'Nikko' is acute with weak reflexing of the margin. The undulation of the margin of the petal of 'NCDX1' is weak while 'Nikko' has none. The petal of 'NCDX1' is larger than that of 'Nikko'. The plants of 'NCDX1' begin flowering early in the season while those of 'Nikko' flower very early.


PLANT: deciduous, upright to bushy rounded, medium degree of branching (dense in summer), medium density of foliage (dense in summer)
STEM: medium thickness, absent or very weak anthocyanin colouration, smooth, red-brown

LEAF: opposite arrangement, simple type, elliptic and lanceolate, acuminate apex, cuneate base, serrate margin, weak glossiness of upper side, sparse pubescence on upper side, absent or very sparse pubescence on lower side, absent or very weak fragrance, medium green on upper side, light green on lower side, no variegation, petiole present
NEWLY OPENED LEAF: medium green

INFLORESCENCE: panicle, weak fragrance, rotate (star like)
FLOWER BUD: ovate, white (RHS NN155B)
CALYX: medium green, sepals are light green, very weak anthocyanin colouration on upper calyx, no anthocyanin colouration on sepals
PETAL: five, elliptic, broadly acute and obtuse apex, entire margin, weak undulation of margin, reflexing of margin is medium reflexing, inner and outer sides are white (NN155D)
POLLEN: yellow
FLOWERING PERIOD: early in the season

Origin & Breeding History: 'NCDX1' originated from a hybrid cross conducted between Deutzia gracilis variety 'Nikko' as the female parent and Deutzia x rosea variety 'Carminea' as the male parent in the spring of 2006 in Mills River, North Carolina, USA. 'NCDX1' was bred and developed by the breeder, Thomas Green Ranney, an employee of North Carolina State University in Raleigh, North Carolina, USA. In the spring of 2007, the variety was selected based on its compact growth habit and prolific flowering.

Tests & Trials: The comparative trial for 'NCDX1' was conducted in an indoor container trial during the spring of 2014 at BioFlora Inc. in St. Thomas, Ontario. The trial included a total of 15 shrubs each of the candidate and reference variety. All shrubs were grown from liners and planted into 8.8 litre containers on July 11, 2013. In 2013, plants were grown outdoors in an irrigated area and transferred to a polyhouse in November 2013. Observations and measurements were taken from 10 plants of the candidate variety 'NCDX1' on April 24, 2014 and 10 plants of the reference variety 'Nikko' on April 14, 2014. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'NCDX1' with reference variety 'Nikko'

Flower diameter (cm)

  'NCDX1' 'Nikko'
mean 1.9 1.2
std. deviation 0.17 0.10

Petal length (mm)

  'NCDX1' 'Nikko'
mean 12.3 10.9
std. deviation 0.71 0.60

Petal width (mm)

  'NCDX1' 'Nikko'
mean 5.1 4.6
std. deviation 0.33 0.53

Click on image for larger view
Deutzia: 'NCDX1' (left) with reference variety 'Nikko' (right)

Click on image for larger view
Deutzia: 'NCDX1' (left) with reference variety 'Nikko' (right)

Click on image for larger view
Deutzia: 'NCDX1' (left) with reference variety 'Nikko' (right)

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