SMNHSG

Hydrangea

Variety Description

Variety used for comparison: 'SMNHSI' (Let's Dance Can Do!)

Summary: The petiole of ‘SMNHSG' is longer than that of ‘SMNHSI'. The degree of rugosity on the leaf blade of ‘SMNHSG' is medium while it is weak for that of ‘SMNHSI'. The inflorescence of ‘SMNHSG' is larger in diameter than that of ‘SMNHSI'. The calyx of the sterile flower of ‘SMNHSG' is wider than that of ‘SMNHSI'. Margin incisions are present on all sepals of the sterile flower for ‘SMNHSG' while they are only present on some sepals for ‘SMNHSI'. The margin incisions of the sepal of the sterile flower of ‘SMNHSG' are of medium depth while those of ‘SMNHSI' are shallow. The sepal of the sterile flower of ‘SMNHSG' is medium purple red fading to medium blue pink with no secondary colour while that of ‘SMNHSI' is mainly medium blue pink to dark blue pink at the margin fading to light violet to light blue pink to white towards the base with a white secondary colour.

Description:

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

STEM: no fasciation, green, medium to many small to medium sized blackish lenticels

PETIOLE: green to red at base
LEAF BLADE: no lobing, elliptic shape, medium to long tip, obtuse base, shallow to medium depth margin incisions, absent or very weak intensity of anthocyanin colouration, no variegation, dark green, no secondary colour, absent or weak glossiness of upper side, medium degree of rugosity, flat in cross-section

INFLORESCENCE: flattened shape, very conspicuous fertile flowers, sterile flowers arranged in one whorl
STERILE FLOWER: four and five sepals
SEPALS OF STERILE FLOWER: horizontal attitude, pointed to obtuse apex, absent or weak rugosity, flat to weakly concave in cross-section, strong degree of overlapping, absent or weak undulation, medium depth margin incisions present on all sepals, medium purple red (RHS 60D) fading to medium blue pink (RHS 68B) when mature, no secondary colour
PETAL OF FERTILE FLOWER: pink

Origin & Breeding History: ‘SMNHSG' originated from a controlled cross that occurred between the female parent variety ‘MAK20', and the male parent variety ‘Dariya' in Grand Haven, Michigan, USA in the summer of 2016. In the summer of 2018, a single unique plant was selected from the resulting progeny in Grand Haven, Michigan based on its flowering density on both terminal and lateral branches, foliage colour, remontant flowering, inflorescence type and sepal colour. Asexual reproduction of ‘SMNHSG' was first conducted by softwood cuttings in 2018 in Grand Haven, Michigan, USA.

Tests & Trials: The comparative trial for ‘SMNHSG' was conducted in an outdoor container trial during the summer of 2025 in St. Thomas, Ontario. The trial included 10 shrubs each of the candidate and reference variety. All plants were grown from rooted cuttings and transplanted into 13.6 litre containers in the summer of 2024. Observations and measurements were taken from 10 plants, or 10 parts of plants, of each variety on June 5, 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 'SMNHSG' with reference variety 'SMNHSI'

Petiole length (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: 'SMNHSG' (left) with reference variety 'SMNHSI' (right)

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Hydrangea: 'SMNHSG' (left) with reference variety 'SMNHSI' (right)

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Hydrangea: 'SMNHSG' (left) with reference variety 'SMNHSI' (right)