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Variety traits

Winter Hardiness — Hydrangea macrophylla

Hydrangea macrophylla (Thunb.) Ser.

For Hydrangea macrophylla, winter hardiness is determined by the ability of flower buds formed on the previous year's shoots to withstand low temperatures without damage. The primary criterion for assessment is the preservation of shoots and the flowering potential in the following season.

In the reference 187 varieties crop Bigleaf hydrangea, where this is mentioned in the description.

For Hydrangea macrophylla, the critical parameter is the temperature threshold for damage to generative buds. In traditional varieties, these can be damaged at temperatures around –5 °C, whereas modern series are capable of withstanding up to –23…–29 °C. Winter hardiness assessment includes an analysis of the percentage of overwintered shoots, bud break dynamics, and biochemical markers of adaptation, such as the level of catalase enzymatic activity and cell sap acidity.

Winter hardiness directly determines the cultivation technology and flowering pattern of the crop. In ordinary varieties, freezing of the aerial part leads to a complete absence of flowering, which necessitates mandatory protection or transition to container cultivation. In remontant varieties capable of forming buds on current-year shoots, high winter hardiness primarily influences the timing and abundance of flowering, allowing the plant to recover even in the event of partial loss of the previous year's shoots.

General information about the subject — on the page Winter hardiness.

Sources8

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.

PIIHM-II

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Michael Dirr

5 records

Hokomarevo

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Santho Beheer B.V.^^^Kolster Beheer B.V.

6 records

Bailmer

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Vernon Glen Black

FR
5 records

Hobella

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

J.G. Hofstede & W.J.G. Hofstede

DK FR NL
6 records

Blushing Bride

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

University of Georgia, Department of Horticulture

FR
5 records

Hokomac

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Peter Rudolf Kolster

FR
5 records

Bailmacseven

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Roberts David Jonathan,McBee Oren,Schulze Justin

4 records

Bailmacsix

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Michael A. Dirr , Mark Griffith, Rhonda Helvick , Jeff Beasley , Oren McBee , David Jonathan Roberts , Justin Schulze

4 records

HORE0031

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

van Rosmalen Nick

5 records

Frau Nobuko

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Information regarding the breeder received in the contribution to CPVO :Ebihara H.

FR
4 records

H213902

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Hydrangea Breeders Association B.V.

4 records

Lady in Red

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

MICHAEL A DIRR

FR
5 records

Zorro

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

van Zoest B.V. Andre|Reeuwijk 2811 PS, NL

FR
4 records

Homigo

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

WJG & JG, Hofstede

FR NL
4 records

Ankong

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

SANTHO BEHEER B.V.

FR
4 records

SMNHML

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Wood Timothy D

4 records

Saxbriwhi

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Meinl Katrin

5 records

Bavaria

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Information regarding the breeder received in the contribution to CPVO :HBA B.V.

FR
4 records

Saxdifioros

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Meinl Katrin

5 records

Ramars

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Information regarding the breeder received in the contribution to CPVO :Rampp

FR
3 records

Kompeito

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Toyokazu Ichie

3 records

HORE0034

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Nick van Rosmalen

3 records

Mirai

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

MOTOTERU YATABE ENGEI CORP.

NL
3 records

Camilla

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Information regarding the breeder received in the contribution to CPVO :HBA B.V.

FR
3 records

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