ARTBOE401

Ninebark

Variety Description

Variety used for comparison: 'Seward' (Summer Wine)

Summary: The branches of 'ARTBOE401' are more rigid than the branches of 'Seward' which are of medium stiffness. When the leaf blade is newly open during summer, the colour of the upper side is brown with light green veins and darker brown along the margin and at the apex for 'ARTBOE401' while the upper side is grey brown with light green tones and darker grey brown along the margin and at the apex for 'Seward'. The colour of the upper side of the fully open leaf blade of 'ARTBOE401' is dark brown with shades of darker brown while the leaf blade of 'Seward' is dark green. The colour of the seed pod of 'ARTBOE401' is red pink whereas the seed pod of 'Seward' is light green with red pink tips and develops more red tones with age. Glossiness of the seed pod of 'ARTBOE401' is of medium intensity whereas the glossiness of the seed pod of 'Seward' is weak.

Description:

SHRUB: deciduous, upright growth habit, medium density of foliage, medium density of branches
BRANCH: erect attitude, rigid stiffness, dark brown, medium density of secondary branches
SECONDARY BRANCH: red brown, very strong intensity of anthocyanin colouration

LEAF: alternate arrangement along branches, ovate shape, acuminate apex, cordate base, dentate margin, strong degree of folding when newly open, medium to strong lobing
UPPER SIDE OF LEAF BLADE: weak glossiness, medium prominence of midrib, brown (closest to RHS 176A-B) with light green (RHS N144A) veins and brown (RHS 166A) at margin and apex when newly open during summer, dark brown (RHS N200A) with shades of darker brown (RHS 200A) when fully open
LOWER SIDE OF LEAF BLADE: medium prominence of midrib, weak to medium intensity of brown purple (RHS 184A) anthocyanin colouration of midrib, brown green (closest to RHS 147B-C)
PETIOLE: present

INFLORESCENCE: corymb type
COROLLA: rotate form, inner side is white (RHS NN155B) with light blue pink (RHS 62D) blush, outer side is white (RHS NN155B) with light blue pink (RHS 62C) stripe along center of each petal

SEED POD: red pink (lighter than RHS 43D), medium intensity of glossiness

Origin & Breeding History: 'ARTBOE401' was bred and developed by the breeder, Arthur Boe, of Faribault, Minnesota, USA. It originated from an open pollinated cross conducted in June 2000 between the Physocarpus opulifolius varieties 'Monlo' as the female parent and 'Nugget' as the male parent. 'ARTBOE401' was selected in 2003 for its plant growth habit, foliage colour, and foliage appearance. Asexual reproduction of 'ARTBOE401' by softwood cuttings was first conducted in July 2003 in Faribault, Minnesota, USA.

Tests & Trials: The comparative trial of 'ARTBOE401' was conducted as an outdoor irrigated container trial during the summer of 2014 at BioFlora Inc. in St. Thomas, Ontario. It included a total of 15 shrubs of the candidate variety and 8 shrubs of the reference variety. All shrubs were grown from rooted cuttings and transplanted into 13.5 litre containers on June 14, 2013. The trial was arranged in rows with approximately 1 m spacing between shrubs. Observations and measurements were taken from 10 shrubs or parts of shrubs of each variety on June 20, 2014. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'ARTBOE401' with reference variety 'Seward'

Colour of upper side of leaf blade (RHS)

Colour of seed pod (RHS)

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Ninebark: 'ARTBOE401' (left) with reference variety 'Seward' (right)

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Ninebark: 'ARTBOE401' (left) with reference variety 'Seward' (right)