Variety traits

Frost hardiness

Frost hardiness is the genetically determined ability of a plant to withstand exposure to sub-zero temperatures without tissue damage. This indicator reflects the critical temperature threshold beyond which the plant dies.

Mentioned in descriptions 11 978 varieties reference book.

Frost hardiness represents the ability of a plant organism to resist the impact of low sub-zero temperatures. It determines the critical threshold above which plant tissues undergo irreversible damage or death. Unlike overall winter hardiness, which also accounts for damping-off and the effects of thaws, frost hardiness focuses specifically on the cellular response to cold exposure.

This trait is genetically determined; however, its expression depends on the physiological state of the plant and the dynamics of external conditions. Frost hardiness is not a constant value: it increases during the period of deep winter dormancy and gradually decreases towards spring, as the plant loses its ability to resist cold due to dehardening.

The evaluation of frost hardiness during variety testing is conducted through laboratory freezing in controlled conditions or through long-term field observations of crop survival. For variety comparison, scoring scales, percentage of survival, or the determination of minimum permissible temperatures in degrees Celsius are used. Maximum realization of the innate genetic potential for frost hardiness is ensured by optimal sowing dates and adequate phosphorus-potassium fertilization in the autumn.

Sources10

Breakdown by crop

Frost resistance of roses 263 Frost Resistance — Hydrangea macrophylla 162 Grapevine Cold Hardiness 152 Lily Frost Hardiness 106 Apple Frost Resistance 84 Grapevine Cold Hardiness 78 Clematis Frost Resistance 71 Tulip frost resistance 64 Peach frost hardiness 52 Frost resistance — soft wheat 44 Frost Hardiness of Rhododendron 36 Frost resistance of Heuchera 36 Frost resistance of common heather 30 Frost Hardiness of Zantedeschia 29 Pear frost resistance 24 Frost Hardiness of Sweet Cherry 24 Apple Frost Resistance 24 Gladiolus frost resistance 24 Cold hardiness of fig 24 Chrysanthemum Frost Resistance 21 Plum Frost Resistance 19 Apricot frost resistance 19 Frost resistance — garden strawberry 19 Blueberry frost resistance 18

Found in these crops

Grapevine 301 Rose 193 Lily 150 Common grape vine 142 Apple 119 Tulip 112 Bigleaf hydrangea 82 Clematis 66 Peach 63 Bread wheat 56 Azalea 44 Highbush blueberry 42

Varieties that feature this in their description

Selection based on the description text, not official resistance ratings: such data is not available in registers. Mention indicates that the trait is discussed in the variety's sources; see the variety's profile for details on what is specifically stated.

KEYLAD

Active

Abelia x grandiflora Rehder · Glossy abelia

Klemens Keysers

1 record

HF 1114

Active

Helleborus x hybridus hort. ex Voss x Helleborus x nigercors J. T. Wall

Josef Heuger

1 record

Helmsdale

Terminated

Lavandula L. · Lavender

MARSHWOOD GARDENS LTD

1 record

GRHP11

Active

Hydrangea paniculata Siebold · Panicled hydrangea

Guido Rouwette

1 record

JPD06

Active

Hydrangea quercifolia W. Bartram · Oakleaf hydrangea

Jean-Paul Davasse

1 record

Havana Blues

Active

Geranium wallichianum D. Don ex Sweet · Wallich's geranium

Marco van Noort Vaste Planten V.O.F.

1 record

Happy Halloween

Active

Kniphofia rooperi (T. Moore) Lem.

Kevin Hobbs

1 record

Golden Paradise

Active

Pyracantha M.J. Roem. · Firethorn

Andrew Parker, Diana Parker

1 record

FLOSN200116

Application submitted

Salvia nemorosa L. · Woodland sage

Florensis B.V.

1 record

GRHP10

Active

Hydrangea paniculata Siebold · Panicled hydrangea

Guido Rouwette

1 record

Flamingo

Application submitted

Tulbaghia violacea Harv.

Ivan van ver Walt

1 record

Ice Crystal

Active

Hydrangea quercifolia W. Bartram · Oakleaf hydrangea

Plant Select N.V.

1 record

Innotripf

Terminated

Tricyrtis Wall. · Toad-lily

Susanne Herdegen

1 record

HORE1644

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Lendert De Vos

1 record

Hyflet

Application submitted

Clematis montana Buch.-Ham. ex DC. · Anemone clematis

Hyfryd Plants

1 record

Extreme

Withdrawn

Hosta Tratt. · Hosta

Hendrik Jan van den Top

1 record

Evolution Sunrise

Active

Nerium oleander L. · Oleander

Almendreta Plantas y Cultivos S.L.

1 record

EVIPO111

Active

Clematis L. · Clematis

Poulsen Roser A/S^^^Raymond J. Evison Ltd.

1 record

HERMA

Application submitted

Actinidia deliciosa (A. Chev.) C. F. Liang & A. R. Ferguson · Kiwifruit

Dominique Peix

1 record

HCPF1

Application submitted

Hydrangea aspera Buch.-Ham. ex D. Don · Rough-leaved hydrangea

Jean-Paul Davasse

1 record

DWAGHYB20

Application submitted

Agapanthus L'Hér. · Lily of the Nile

DE WET PLANT BREEDERS (PTY) LTD

1 record

Erina

Active

Camellia rosthorniana Hand.-Mazz.

Akira Shibamichi

1 record

Hgc Merlin

Terminated

Helleborus L. · Christmas Rose

Josef Heuger

1 record

ELLY

Active

Prunus laurocerasus L. · Cherry laurel

Adrian Straver

1 record

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Variety traits

Maturity group 89 063
Yield 67 000
Vigor 53 548
Plant height 51 504
Lodging 50 198
Taste and aroma 36 010
Variety origin 29 523
Productivity 27 845

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Text source

This summary is compiled from the publications listed in the sources and verified by an editor. It contains no legally significant information; it provides agronomic context for registry data rather than the registry data itself.