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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.

Podaras 6

Terminated

Hybrids between Buddleja alternifolia Maxim. and Buddleja davidii Franch.

Cornell University

1 record

Plum Drops

Application submitted

Sanguisorba officinalis L. · Great burnet

Intrinsic Perennial Gardens Inc.

1 record

Pacfavio

Terminated

Pelargonium L'Hér. ex Ait. · Geranium

Elsner pac Jungpflanzen GbR

1 record

MVNC1904

Application submitted

Coreopsis L. · Tickseed

Marco van Noort Breeding B.V.

1 record

Ollede

Application submitted

Hydrangea paniculata Siebold · Panicled hydrangea

P.W. Captein & Zn.

1 record

Miss Magenta

Application submitted

Betonica officinalis L. · betony

Future Plants Licentie B.V.

1 record

MINWIKB25

Active

Wisteria x valderi J. Compton

Hortival Diffusion S.A.S.

1 record

Night Star

Withdrawn

Dianthus L. · Carnation

H.R. WHETMAN & SON

1 record

Minor Gold

Terminated

Forsythia Vahl · Forsythia

Gijsbertus Verhoef

1 record

Patricia

Terminated

Hosta Tratt. · Hosta

Gerardus J.C.M. Heemskerk

1 record

North Country

Active

Vaccinium corymbosum L. · Highbush blueberry

2 records

Parrot

Active

Echinacea Moench. · Coneflower

AB Kwekersrechten B.V.

1 record

Mormin1201

Active

Jasminum officinale L. x Jasminum polyanthum Franch.

BRANDED GARDEN PRODUCTS

1 record

MONSAPHO

Active

Agapanthus africanus (L.) Hoffmanns. · African lily

Jonathan Pedersen

1 record

Merlot Magic

Application submitted

Acer tataricum L. subsp. ginnala (Maxim.) Wesm. · Amur maple

Bob Askew

1 record

Merlot Clusters

Withdrawn

Tradescantia virginiana L. · Virginia spiderwort

Paul Gooderham

1 record

Patricia

Active

Calluna vulgaris (L.) Hull · Common heather

Johannes van Leuven

1 record

MINSYGROU02

Application submitted

Hibiscus syriacus L. · Rose of Sharon

Hortival Diffusion S.A.S.

1 record

Mozzarella

Withdrawn

Echinacea purpurea (L.) Moench · Purple coneflower

Marco van Noort Vaste Planten V.O.F.

1 record

Meimulany

Terminated

Rosa L. · Rose

Alain Antoine Meilland

1 record

Meimouvie

Terminated

Rosa L. · Rose

Alain Antoine Meilland

1 record

MINSYROI5

Active

Hibiscus syriacus L. · Rose of Sharon

Hortival Diffusion S.A.S.

1 record

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