Golia Rosbi

Dahlia

Variety Description

Variety used for comparison: 'Dapavio' (Dahlietta Caroline)

Summary: The plants of 'Golia Rosbi' are shorter than the plants of 'Dapavio'. The peduncle of 'Golia Rosbi' is shorter than the peduncle of 'Dapavio'. The flower of 'Golia Rosbi' is single while the flower of 'Dapavio' is a daisy eyed double. The flower head diameter is smaller for 'Golia Rosbi' than for 'Dapavio'. The ray florets of 'Golia Rosbi' have secondary colour present while the ray florets of 'Dapavio' have no secondary colour.

Description:

PLANT: upright growth habit, green stem

LEAF: predominantly simple, no leaf wing, elongated length to width ratio, medium green, weak glossiness, weakly rugose texture, veins slightly raised
LEAFLET: broad ovate shape, obtuse or cuneate base, medium to many incisions on margin, incisions shallow to medium in depth

PEDUNCLE: green

FLOWER: medium length to width ratio, at same level in relation to foliage, semi-upright to horizontal attitude, single, daisy type, no collar segments, few ray florets
RAY FLORETS: two keels on upper surface, weakly concave in cross section, flat to weakly revolute margin with rolling at basal half, longitudinal axis weakly reflexing with curvature at distal part, absent or very weak twisting, apex dentate, inner side purple red (RHS N66B) streaked with dark purple red (RHS 53A), white (RHS 155A) secondary colour at basal half and yellow green (RHS 1C) at base, secondary colour in a solid or nearly solid pattern, outer side light blue pink (RHS 69B), fading to white (RHS NN155D) with streaks of purple (RHS 67A)
DISC: small diameter relative to flower head, yellow-orange before and after anther dehiscence.

Origin & Breeding History: The dahlia variety 'Golia Rosbi' originated from a cross made in August 2006 in Andijk, The Netherlands. The female parent was a proprietary line designated D05-100-2 and the male parent was a proprietary line designated D05-100-4. The resultant seed was sown in a greenhouse in November 2006. In February 2007, a single plant from the progeny was selected based on flower colour, plant habit and production characteristics.

Tests & Trials: Trials for 'Golia Rosbi' were conducted in a polyhouse during the spring of 2010 at BioFlora Inc. in St. Thomas, Ontario. The trial included a total of fifteen plants of the candidate and reference varieties. All plants were grown from rooted cuttings and transplanted into 11 cm pots on May 10, 2010. Observations and measurements were taken from ten plants or parts of plants on June 15, 2010. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Golia Rosbi' with reference variety 'Dapavio'

Plant height (cm)

Peduncle length (cm)

Flower head diameter (cm)

Main colour of ray floret (RHS)

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Dahlia: 'Golia Rosbi' (left) with reference variety 'Dapavio' (right)

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Dahlia: 'Golia Rosbi' (left) with reference variety 'Dapavio' (right)