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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.

KEYLIB

Withdrawn

Abelia x grandiflora Rehder · Glossy abelia

Klemens Keysers

1 record

June

Terminated

Gladiolus L. · Gladiolus

FRED W. NAGEL & SONS INC

1 record

Kolmat

Terminated

Ilex verticillata (L.) A. Gray · Winterberry

Kolster Beheer B.V.

1 record

Kolmamissi

Application submitted

Salvia xjamensis J. Crompton · Jame sage

Kolster Holding B.V.

1 record

Jorma

Active

Vaccinium L. · Bilberry

Luonnonvarakeskus / Natural Resources Institute Finland (Luke)

2 records

Heraklion

Terminated

Lilium L. · Lily

Vletter & Den Haan Beheer B.V

1 record

Jive

Terminated

Lilium L. · Lily

De Jong Beheer B.V.

1 record

Jan 110

Active

Fargesia murielae x Fargesia nitida

Wilfried Janßen

1 record

HSPS23

Application submitted

Hydrangea serrata (Thunb.) Ser. var. serrata · Tea-of-heaven

Plant Select N.V.

1 record

IFECSSC

Active

Echinacea Moench. · Coneflower

Jelle van den Haak

2 records

INLOBLXBLE

Terminated

Lobelia erinus L. · Edging lobelia

Birgit Hofmann

1 record

GRT1

Withdrawn

Sorbus vilmorinii C. K. Schneid. · Vilmorin's rowan

Gordon Ross Thomson

1 record

GRHYARUP2

Application submitted

Hydrangea arborescens L. · Smooth hydrangea

Guido Rouwette

1 record

H2f3

Active

Paulownia catalpifolia x Paulownia fortunei

WEGROW GERMANY GMBH

1 record

Hilmimi

Terminated

Dianthus caryophyllus L. · Carnation

HilverdaKooij B.V

1 record

Kim Wall

Terminated

Rosa L. · Rose

Per Eskelund Mortensen

1 record

HSOPR014

Terminated

Hydrangea serrata (Thunb.) Ser. var. serrata · Tea-of-heaven

Plant Select N.V.

1 record

Grifie

Active

Rhododendron catawbiense Michx. · catawba rhododendron

Jules Block N.V.

1 record

HG2019

Withdrawn

Thalictrum aquilegiifolium L.

HERBERT OUDSHOORN

1 record

Galibier

Active

Lilium L. · Lily

Vletter & Den Haan Beheer B.V

1 record

Heart of Darkness

Terminated

x Heucherella H. R. Wehrh. · Foamy bells

CHARLES OLIVER

1 record

Go Go Red

Active

Tulipa L. · Tulip

Remarkable C.V.

1 record

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