Helleborus niger Helleborus nigerCommon name(s): Christmas Rose, Black HelleboreBlooming time: winter to springBlooming colors: whiteHeight: 20 to 30 cmOrigin: EuropeHardiness zone (USDA): Z3 – up to -34 °CFamily: RanunculaceaeDuring fading the petals turn greenish or reddish.Related plants:Aconitum carmichaeliiAnemone blandaCaltha palustrisClematis vitalbaEranthis cilicicaEranthis hyemalisHelleborus orientalisPulsatilla vulgarisRanunculus asiaticus