Variety traits
Hydrangea macrophylla (Thunb.) Ser.
This trait is characterized by an increased number of petaloid sepals in sterile flowers and serves as a key ornamental target for Hydrangea macrophylla.
In the reference 88 varieties crop Bigleaf hydrangea, where this is mentioned in the description.
In Hydrangea macrophylla, double-flowering manifests as the formation of multi-layered, ruffled, or star-shaped blooms. In breeding and variety testing, this trait is evaluated qualitatively through visual assessment of the number of petaloid sepal whorls and inflorescence density, as there is no standardized quantitative scale for it.
The expression of a cultivar’s double-flowering potential often depends on the age of the plant, with young specimens sometimes failing to reach target levels in their first years. The formation of complex flowers requires significant resources; therefore, a balanced nutrient program, with an emphasis on potassium and phosphorus, is essential for maintaining ornamental quality. A high degree of double-flowering increases the weight of the inflorescences, which often leads to shoot lodging and necessitates the use of supports or specialized pruning.
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 macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Information regarding the breeder received in the contribution to CPVO :Mallet C.
Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Information regarding the breeder received in the contribution to CPVO :Wintergalen J.