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.

Eye Spy

Active

x Heucherella H. R. Wehrh. · Foamy bells

Hansen Hans A

3 records

Curlew

Active

Vicia faba L. · Broad bean

Norddeutsche Pflanzenzucht Hans-Georg Lembke KG

5 records

Columbia star

Active

Rubus L. subg. Rubus · Blackberry

USDA, USA

4 records

Evipo068

Active

Clematis L. · Clematis

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

3 records

Evipo051

Active

Clematis L. · Clematis

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

3 records

El Niño

Active

Hosta Tratt. · Hosta

Warmerdam Petrus Th.|2204 AK Noordwijk, NL

3 records

Evipo039

Active

Clematis L. · Clematis

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

3 records

EPB 29

Active

Helleborus x hybridus hort. ex Voss · Lenten rose

RODNEY DAVEY|LYNDA WINDSOR

3 records

Cupid

Active

Lamprocapnos spectabilis (L.) Fukuhara · Asian bleeding-heart

Pryce Matthew

3 records

Boubri

Application submitted

Albizia julibrissin Durazz. · Mimosa

Bourquin, M. Andre|Borderez Sur Lechez, FR

4 records

Botex 011

Active

Buddleja davidii Franch. · Butterfly bush

Koot Johannes Adrianus Maria

3 records

Brilliant Blue

Active

Agapanthus L'Hér. · Lily of the Nile

Vance James Hooper, Vance James Hooper

4 records

Cleopatra

Active

Phlox paniculata L. · Garden phlox

Geerlings-Meyer

4 records

Destiny

Active

x Semponium spp.

Michael Daniel

3 records

Discovery

Active

Forsythia x intermedia Zabel · Border forsythia

Mitchell Elizabeth

3 records

Dark Magic

Active

Hylotelephium telephium (L.) H. Ohba · Orpine

Janet N. Egger

4 records

BINBLASCA

Active

Ajuga reptans L. · Bugle

Mike Tristram

3 records

Crystal Blue

Active

Salvia x sylvestris L. · Wood sage

Van Der Kolk, Jerry

3 records

Bremdream

Active

Geranium L. · Crane's Bill

Alan H. Bremner

3 records

Coconut Ice

Protection expired

Lavandula angustifolia Mill. · English lavender

Lavenite Enterprises

3 records

Chico Merano

Active

Campanula glomerata L. · Clustered bellflower

van der Zwet, Alexius Joannes J.

3 records

Blue Rivulet

Active

Campanula poscharskyana Degen · Trailing bellflower

Bloom Adrian|Bressingham, Diss, Norfolk IP22 2AB, GB

3 records

Candy Hearts

Active

Dicentra Bernh. · Bleeding heart

Shiozaki Akira|Fukagawa, JP

3 records

Amethyst Falls

Active

Wisteria frutescens (L.) Poir. · American wisteria

Robert H Head, William A Head and Lisa J Head

3 records

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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.