Chewamberness

Rose

Variety Description

Variety used for comparison: 'Chewgewest' (Oso Easy Sunorita)

Summary: The plants of ‘Chewamberness' are taller than those of ‘Chewgewest'. The leaf of ‘Chewamberness' has an absent or very weak glossiness of the upper side and is larger than that of ‘Chewgewest', which has a strong glossiness of the upper side. The flower of ‘Chewamberness' has a larger diameter and a greater number of petals than that of ‘Chewgewest'. The petal of ‘Chewamberness' is larger than that of ‘Chewgewest'. When mature, the inner side of the petal of ‘Chewamberness' is medium yellow with light yellow at the margins and dark yellow at the base while that of ‘Chewgewest' is light and medium orange throughout.

Description:

PLANT: shrub type, strong intensity of anthocyanin colouration on young shoot

STEM: few yellowish to reddish prickles

LEAF (UPPER SIDE): medium green, absent or very weak degree of glossiness
LEAFLET: absent or very weak undulation of margin
TERMINAL LEAFLET: medium elliptic shape, obtuse to rounded base, acuminate apex

FLOWER: double type, yellow blend colour group, round shape, flat to flattened convex profile of upper part, concave profile of lower part, medium fragrance, absent or very weak sepal extensions
PETAL: no reflexing of petals one-by-one, obovate shape, absent or very weak incisions, absent or very weak reflexing of margin, weak undulation
PETAL (INNER SIDE): one colour, medium yellow (RHS 12B) with light yellow (RHS 12C) at margins and dark yellow (RHS 14B) at base when mature, light yellow (RHS 10D) when aged
PETAL BASAL SPOT (INNER SIDE): very small to small, orange yellow
PETAL (OUTER SIDE): light yellow to medium yellow orange (RHS 15-16D) when mature, light yellow (RHS 13D) when aged
OUTER STAMEN: predominantly medium yellow filament

Origin & Breeding History: 'Chewamberness' originated from a controlled hybrid cross conducted between the female variety ‘Gardner's Glory' and the male variety ‘Tan04603' in June 2011 in Brockton, United Kingdom. From the resulting progeny, the new variety was selected based on flower colour, growth habit, and continuous blooming in September 2013. ‘Chewamberness' was first propagated asexually by cuttings in September 2013 in Brocton, United Kingdom.

Tests & Trials: The comparative trial for ‘Chewamberness' was conducted outdoors during the summer of 2024 at Bioflora Inc., in St. Thomas, Ontario. The trial included a total of 9 plants of the candidate variety and 10 plants of the reference variety. All plants were grown from bare-rooted plants transplanted into 11.4 liter containers in summer 2023. Observations and measurements were taken from 10 plants, or parts of plants, on August 16, 2024. All colour determinations were made using the 2015 Royal Horticultural Society (RHS) Colour Chart. Mean differences were significant at the 5% confidence probability level based on a paired Student's t-test.

Comparison tables for 'Chewamberness' with reference variety 'Chewgewest'

Plant height during second flush (cm)

Leaf length (cm)

Leaf width (cm)

Number of petals per flower (count)

Flower diameter (cm)

Petal length (cm)

Petal width (cm)

Main colour of the inner side of the petal (RHS)

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Rose: ‘Chewamberness' (left) with reference variety ‘Chewgewest' (right)

Click on image for larger view

Rose: ‘Chewamberness' (left) with reference variety ‘Chewgewest' (right)