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Variety traits

Hellebore winter hardiness

Helleborus L.

Winter hardiness of Hellebore is defined as the ability of a species or cultivar to withstand critical sub-zero temperatures and unfavorable overwintering conditions without the use of quantitative metrics.

In the reference 8 varieties crop Christmas Rose, where this is mentioned in the description.

For Hellebore, winter hardiness is evaluated as a species trait, expressed through threshold survival temperatures. For instance, Helleborus niger is capable of withstanding frosts down to -35°C, whereas Helleborus orientalis requires covering during winters with little snow, and species of Mediterranean origin are the least resistant to harsh conditions.

A critical factor for the crop is not only the absolute minimum temperature but also the susceptibility to damping off. Overwintering stability also depends on the age of the plant, with older specimens often overwintering worse than younger ones, and the early onset of vegetation during thaws exposes plants to the risk of damage from ice crusts or late spring frosts.

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

Sources2

Varieties of Christmas Rose 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.

Tutu

Active

Helleborus L. · Christmas Rose

Eternal Plants Boijl B.V.

5 records

ABCRD01

Active

Helleborus L. · Christmas Rose

RODNEY DAVEY|LYNDA WINDSOR

4 records

Ivory Prince

Active

Helleborus L. · Christmas Rose

David Tristram

4 records

Pirouette

Active

Helleborus L. · Christmas Rose

ANTHONY ROBIN WHITE|SUSAN BARBARA WHITE

3 records

COSEH 3140

Active

Helleborus L. · Christmas Rose

Josef Heuger

2 records

COSEH 4000

Active

Helleborus L. · Christmas Rose

Josef Heuger

2 records

COSEH 4200

Active

Helleborus L. · Christmas Rose

Josef Heuger

2 records

COSEH 4600

Active

Helleborus L. · Christmas Rose

Josef Heuger

2 records

COSEH 4800

Active

Helleborus L. · Christmas Rose

Josef Heuger

2 records

COSEH 5000

Active

Helleborus L. · Christmas Rose

Josef Heuger

2 records

COSEH 5300

Active

Helleborus L. · Christmas Rose

Josef Heuger

2 records

COSEH 5400

Active

Helleborus L. · Christmas Rose

Josef Heuger

2 records

COSEH 5600

Active

Helleborus L. · Christmas Rose

Josef Heuger

2 records

COSEH 5900

Active

Helleborus L. · Christmas Rose

Josef Heuger

2 records

COSEH 6900

Active

Helleborus L. · Christmas Rose

Josef Heuger

2 records

COSEH 7300

Active

Helleborus L. · Christmas Rose

Josef Heuger

2 records

HLR 190

Active

Helleborus L. · Christmas Rose

Josef Heuger

2 records

Harvington Rebekah

Active

Helleborus L. · Christmas Rose

Hugh L. Nunn^^^Elizabeth A. Nunn

2 records

Hgc Jericho

Active

Helleborus L. · Christmas Rose

Josef Heuger

2 records

Little Darling

Active

Helleborus L. · Christmas Rose

P.C.M. Olsthoorn Holding B.V.

2 records

Winterbells

Active

Helleborus L. · Christmas Rose

K. Sahin Zaden B.V.

2 records

COSEH 4500

Active

Helleborus L. · Christmas Rose

Josef Heuger

1 record

Star of Love

Active

Helleborus L. · Christmas Rose

Jacobus R. de Jong

1 record