Yojuneau

Chrysanthemum

Variety Description

Variety used for comparison: 'White Blush'

Summary: The plants of 'Yojuneau' are shorter than the plants of 'White Blush'. The growth habit is upright for 'Yojuneau' while it is semi-upright for 'White Blush'. The lowest lateral sinus of the leaf of 'Yojuneau' is deep with parallel margins while the lower lateral sinus of the leaf of 'White Blush' is medium in depth with diverging margins. The outer side of the flower bud of 'Yojuneau' is white while it is yellow green for 'White Blush'. The flower head of 'Yojuneau' is smaller in diameter than the flower head of 'White Blush'. The ray floret of 'Yojuneau' is shorter than the ray floret of 'White Blush'.

Description:

PLANT: bushy type, upright growth habit, green stem

PETIOLE: moderately upwards to horizontal attitude, medium length relative to leaf length
LEAF: terminal lobe medium to long relative to leaf length, lowest lateral sinus deep with parallel margins, base obtuse and truncate, upper side dark green with weak glossiness, margin indentations deep and many in number

FLOWER: medium to many flower heads per plant, outer side of bud white (RHS 155A), semi-double daisy head type
RAY FLORETS: two to three rows, predominantly ligulate type, moderately ascending attitude of basal part, upper surface with two keels, very short corolla tube, flat profile in cross section at widest point, flat margin, straight along longitudinal axis, dentate and mamillate tip
RAY FLORET: inner and outer side white (RHS NN155D)
DISC: small diameter relative to head diameter, slightly domed in cross section, green before anther dehiscence with no dark spot at centre, medium yellow at anther dehiscence.

Origin & Breeding History: The variety 'Yojuneau' originated from a controlled pollination conducted in February 2003 in Salinas, California, USA. The female parent was the variety 'Yodurban' and the male parent was a proprietary seedling designated YB-A1635. The new variety was selected in November 2003 in Fort Myers, Florida. The selection criteria included growth habit, strong stems, flowering response, flower form and colour, immature disc colour, absence of pollen and excellent post production longevity. Asexual reproduction by vegetative tip cuttings was first conducted in Fort Myers, Florida, USA in February 2004.

Tests & Trials: Trials for 'Yojuneau' were conducted in a greenhouse trial during the Fall of 2011 in Niagara-on-the-Lake, Ontario. On August 8, 2011, fifty unrooted cuttings were directly stuck into 15 cm pots, with 5 cuttings per pot. The trial included a total of 10 pots of each variety spaced 30 cm apart. Plants were pinched once prior to short day treatment. Observations and measurements were taken from 10 plants of each variety on November 8, 2011. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Yojuneau' with reference variety 'White Blush'

Plant height (cm)

Colour of flower bud (RHS)

Flower head diameter (cm)

Ray floret length (cm)

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Chrysanthemum: 'Yojuneau' (left) with reference variety 'White Blush' (right)

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Chrysanthemum: 'Yojuneau' (left) with reference variety 'White Blush' (right)