Variety traits
Hydrangea serrata (Thunb.) Ser. var. serrata
Double-flowering in Hydrangea serrata is a qualitative varietal trait of sterile peripheral florets, characterized by an increased number of petaloid sepals within a lacecap-type inflorescence.
In the reference 24 varieties crop Tea-of-heaven, where this is mentioned in the description.
For Hydrangea serrata, double-flowering is not a standardized quantitative metric and is described by the presence of single, semi-double, or double sterile florets. The trait is localized in the peripheral zone of the inflorescence and consists of a genetically determined increase in the number of petaloid sepals.
The presence of double-flowering visually alters inflorescence density, yet it does not affect the fertile florets at the center, preserving the plant's biological role for insect pollinators. In some breeding lines, this trait is associated with adaptive properties, such as the ability to rebloom on current-season shoots.
General information about the subject — on the page Double flowering / Reversion.
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.
Hydrangea serrata (Thunb.) Ser. var. serrata · Tea-of-heaven
Information regarding the breeder received in the contribution to CPVO :Katsumata Kazuyoshi