Verbetering trekresultaten van vroege trek bij Viburnum opulus "Roseum" (sneeuwbal): Onderzoek naar bloemknopontwikkeling en koubehoefte voor rustdoorbreking

    Research output: Book/ReportReportProfessional


    Abstract In the early forcing of Viburnum opulus 'Roseum' (Snowball), results are sometimes disappointing: only a few or sometimes none of the buds develop into inflorescences, or so-called 'grass balls' emerge. At the request of the growers and with funding from the Horticulture Board, Wageningen UR Greenhouse Horticulture, explored flower bud development in Viburnum. The starting time of flower bud development varies. An early start leads to a high number of flower buds per branch. After the development of the flower buds, they go into winter dormancy. Problems with development to inflorescences are due to lack of cold for breaking bud dormancy. Viburnum needs 900 hours of 2 to 8 oC to break bud dormancy. ‘Grass Balls’ are caused by incomplete flower bud development. If the flowers in an inflorescence are not or incompletely developed, small green leaves grow from the inflorescence.
    Original languageDutch
    Place of PublicationBleiswijk
    PublisherWageningen UR Glastuinbouw
    Number of pages70
    Publication statusPublished - 2011

    Publication series

    NameRapporten GTB
    PublisherWageningen UR Glastuinbouw


    • viburnum
    • forcing
    • earliness
    • false negative results
    • buds
    • flowers
    • development
    • research

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