H21-3
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Ryoji Irie
Variety traits
Double-flowering in Hydrangea macrophylla
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.
Varieties of Bigleaf 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.
YOUME H19-17
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Ryoji Irie
RIE 01
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Ryoji Irie
FR
6 records
RIE 02
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Ryoji Irie
FR
6 records
RIE 09
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Ryoji Irie
FR
6 records
Youmethree
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Ryoji Irie
FR
5 records
Blushing Bride
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
University of Georgia, Department of Horticulture
FR
5 records
youmefour
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Ryoji Irie
FR
4 records
RIE 06
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Ryoji Irie
FR
4 records
Peace
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Ryojie Irie
Kompeito
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Toyokazu Ichie
Shamrock
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Mallet, Corinne
FR
3 records
Tinkerbell
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Toyokazu Ichie
Inspire
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Ryoji Irie
Frau Fujiyo
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Information regarding the breeder received in the contribution to CPVO :Ebihara H.
FR
3 records
Freedom
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Ryoji Irie
Trophy
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
OWENS A.
FR
3 records
Youmenine
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Ryoji Irie
FR
3 records
H216906
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Hydrangea Breeders Association B.V.
Perfrie
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Ryoji Irie
Youmetwo
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Ryoji Irie
FR
3 records
ICH10162B
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Toyokazu Ichie
RIE 04
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Ryoji Irie
FR
3 records
RIE 05
ActiveHydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea
Ryoji Irie
FR
3 records