Horcoherent

Rose

Variety Description

Varieties used for comparison: 'Noatraum' (Flower Carpet Pink) and 'Poullen' (Natchez)

Summary: 'Horcoherent' is a compact shrub growth type while the reference varieties are ground cover growth types. The young shoot of 'Horcoherent' has stronger anthocyanin colouration and more prickles along the stem than 'Poullen'. 'Horcoherent' has a longer leaf than 'Poullen' but shorter than 'Noatraum'. The number of flower petals in 'Horcoherent' is less than the reference varieties. 'Horcoherent' has a larger flower diameter than 'Poullen'. The flower petal of 'Horcoherent' has weaker undulation of the margin than 'Noatraum'. 'Horcoherent' has a larger flower petal than 'Poullen'. The main colour on the inner side of the flower petal of 'Horcoherent' is a light red pink while it is purple red in 'Noatraum' and white to a light blue pink in 'Poullen'. 'Horcoherent' has a larger basal spot on the inner side of the flower petal than 'Poullen'.

Description:

PLANT: compact shrub type, intermediate growth habit
YOUNG SHOOT ANTHOCYANIN: strong intensity
PRICKLES/THORNS: yellowish and reddish, few on the stem
LEAF: medium green on upper side, strong glossiness on upper side, medium anthocyanin colouration at margin edge and midrib, very weak undulation of margin,
TERMINAL LEAFLET: ovate shape, obtuse base, acuminate to acute apex

FLOWERING SHOOT: few flowering laterals, very few flowers per lateral
FLOWER BUD: medium ovate shape in longitudinal section
SEPAL: absent to very weak extensions
FLOWER: semi-double type, loose petal density, irregularly rounded when viewed from above, flat on upper part when viewed from the side, concave to flat on lower part when viewed from the side, yellow pink blend American Rose Society colour group, absent to very weak fragrance
PETAL: obovate shape, absent to very weak incisions, two colours, light pink red with yellow at the base on inner side, light yellow to light yellow orange on outer side, weak reflexing and undulation of the margin
BASAL PETAL SPOT: small, light yellow on inner side
OUTER STAMEN: medium yellow filament

Origin & Breeding History: 'Horcoherent' originated from the cross made in 1994 between the female parent, 'Noatraum' and the male parent, 'Scrivluv' in Stanstead, Essex, UK. In 1995, a single plant was selected from the progeny based on flower colour, attractive foliage and resistance to diseases.

Tests & Trials: Field trials were conducted during the summer of 2008 in St. Thomas, Ontario. There were 8 plants of each variety planted in May 2007 in rows with plants spaced 2 feet apart and rows spaced 3 feet apart. All colour measurements were made using the Royal Horticultural Society Colour Chart 2001.

Comparison tables for 'Horcoherent' with reference varieties 'Noatraum' and 'Poullen'

Leaf length (cm)

Flower diameter (cm)

Petal length (cm)

Petal width (cm)

Petal colour on inside (RHS)

Click on image for larger view

Rose: 'Horcoherent' (left) with reference varieties 'Noatraum' (centre) and 'Poullen' (right)