Variety traits

Double flowering in oak-leaf hydrangea

Hydrangea quercifolia W. Bartram

Double flowering in Hydrangea quercifolia is a morphological feature of inflorescences where sterile flowers are formed from an increased number of petaloid sepals, creating a multi-layered effect.

In the reference 7 varieties crop Oakleaf hydrangea, where this is mentioned in the description.

In varieties with this trait, sterile flowers have a 'sepal-within-a-sepal' structure, which creates densely packed inflorescences, unlike simple flowers with a single row of sepals. Varieties with pronounced double flowering include 'Snowflake', 'Harmony', 'Gatsby Moon', and 'Vaughn’s Lillie'. In agronomic practice, this trait is evaluated as a qualitative characteristic, as there are no standardized numerical scales for assessing the degree of double flowering.

The selection of double-flowered varieties affects the bush architecture: the significant weight of dense inflorescences increases the risk of shoots lodging, which requires the installation of supports or careful consideration when choosing a planting site. Furthermore, such inflorescences are less resistant to precipitation and wind, and also possess reduced ecological value, as the replacement of fertile flowers with sterile ones limits pollinator access to nectar and pollen.

General information about the subject — on the page Double flowering / Reversion.

Sources8

Varieties of Oakleaf hydrangea mentioned in the description

Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.