Bailmacseven

Hydrangea

Variety Description

Varieties used for comparison: 'Hokomabebos' (Kimono) and 'Jon04' (Tuxedo Red)

Summary: The stem of ‘Bailmacseven' has medium to many medium to large lenticels while the stem of the reference varieties has absent or few to few to a medium number of small lenticels. The leaf blade of ‘Bailmacseven' is narrower than that of the reference varieties. The petiole of ‘Bailmacseven' is shorter than that of the reference varieties. The intensity of anthocyanin colouration on the leaf blade of ‘Bailmacseven' is strong to very strong throughout while it is medium to strong on the leaf blade margin of the reference varieties. The inflorescence of ‘Bailmacseven' is taller than that of ‘Hokomabebos' and larger in diameter than that of both reference varieties. The sepal of the calyx of the sterile flower of ‘Bailmacseven' is narrower than that of both reference varieties. Medium depth margin incisions are present on all sepals of the sterile flower for ‘Bailmacseven' while margin incisions are absent or shallow and only present on some sepals for the reference varieties. The sepal of the sterile flower of ‘Bailmacseven' has dark brown purple, dark purple red to dark brown at the margin transitioning to dark purple to medium purple red towards the base with white at the base while that of ‘Hokomabebos' has dark red purple, red pink to medium purple red at the margin transitioning to medium blue pink to light blue pink towards the base with white at the base and that of ‘Jon04' is medium purple red with white at the base aging to dark blue pink to medium purple red throughout.

Description:

PLANT: non-climbing type, upright to spreading growth habit, broader than tall

STEM: no fasciation, green, medium to many medium to large reddish to blackish lenticels

PETIOLE: green
LEAF BLADE: no lobing, elliptic to obovate shape, long tip, acute to obtuse base, medium depth margin incisions, strong to very strong intensity of anthocyanin colouration distributed throughout, no variegation, dark green, no secondary colour, medium degree of glossiness of upper side, weak rugosity, flat in cross-section

INFLORESCENCE: globular shape, inconspicuous or slightly conspicuous fertile flowers, medium to dense sterile flowers
STERILE FLOWER: between three and four to four and five sepals
SEPALS OF STERILE FLOWER: semi-erect attitude, pointed to rounded apex, absent or weak rugosity, flat in cross-section, medium degree of overlapping, absent or weak undulation, medium depth margin incisions present on all sepals, dark brown purple to dark purple red (RHS N186C-D) to dark brown (RHS 187A) at the margin with dark purple to medium purple red (RHS 59C-D) towards the base and white (RHS NN155C) at the base, white secondary colour distributed in lower half

Origin & Breeding History: 'Bailmacseven' originated from a controlled cross that occurred between two proprietary breeding lines, the female parent designated ‘HM16-P4-01', and the male parent designated ‘HM16-R13-02' in Wintersville, Georgia, USA in the summer of 2016. In the summer of 2018, a single unique plant was selected from the resulting progeny in Wintersville, Georgia based on its foliage colour, inflorescence colour and blooming capacity. Asexual reproduction of ‘Bailmacseven' was first conducted by softwood cuttings in the summer of 2018 in Wintersville, Georgia, USA.

Tests & Trials: The comparative trial for ‘Bailmacseven' was conducted in polyhouse during the summer of 2025 in St. Thomas, Ontario. The trial included 10 shrubs each of the candidate and reference varieties. All plants were grown from rooted cuttings and transplanted into 13.6 litre containers in the spring of 2024. Observations and measurements were taken from 10 plants, or 10 parts of plants, of each variety on June 17, 2025. Mean differences were significant at the 5% confidence probability level based on a paired Student's T-test. All colour determinations were made using the 2015 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'Bailmacseven' with reference varieties 'Hokomabebos' and 'Jon04'

Petiole length (cm)

Leaf blade width (cm)

Inflorescence height (cm)

Inflorescence diameter (cm)

Calyx width of sepal of sterile flower (cm)

Colour of the sepal of sterile flower (RHS)

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Hydrangea: 'Bailmacseven' (left) with reference varieties 'Hokomabebos' (center) and 'Jon04' (right)

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Hydrangea: 'Bailmacseven' (left) with reference varieties 'Hokomabebos' (center) and 'Jon04' (right)

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Hydrangea: 'Bailmacseven' (left) with reference varieties 'Hokomabebos' (center) and 'Jon04' (right)