At the stage of the first or second leaf christmas rose seedlings were pricked to pots or to multiple pots, the roots being rolled or nipped off during the operation. The quality of young plants was estimated by determining the fresh weight, number, and length of leaves and roots. The best quality of young plants was obtained from christmas rose seedlings pricked at the stage of the second leaf and with roots rolled when planted to pots.
W doświadczeniach nad optymalizacją rozmnażania ciemiernika białego z sadzonek, wykorzystano sadzonki pąkowe, liściowo-pąkowe i kłączowe, ukorzęniane w marcu, czerwcu, sierpniu, wrześniu i październiku, przy zastosowania Ukorzeniaczy A, AB, В i B2. Najwięcej i najlepszej jakości ukorzenionych sadzonek uzyskano pobierając sadzonki liściowo-pąkowe w październiku, także we wrześniu i traktując je przed umieszczeniem w perlicie Ukorzeniaczem A.
The Christmas rose (Helleborus niger L.) is widely distributed in Southern and Central Europe, and Slovenia is probably one of the centers of its diversity. The investigation was aimed at evaluating phenotypic diversity among selected wild populations in Slovenia and neighboring Croatia. Some of the analyzed traits expressed relatively very high variation (e.g., number of leaves per plant, number of inflorescences per plant). The variation ranges of some of the analyzed traits were found to be wider than those mentioned in the literature. Statistical analysis indicated that variability was more expressed within than between populations. In terms of present market requirements, the most valuable populations are Žumberak (Croatia), containing plant material with the longest peduncles and largest flowers, and Peca, containing genotypes with the highest number of inflorescences per plant.