To be traded and for examination purposes (trueness-to-type, distinction, uniformity and stability) it is necessary that a cultivar can be identified by its description and name.

For the flower bulb industry the KAVB gathers and registers all cultivars. The whole of descriptions and names can be regarded as a the civil registration service for the flower bulb industry.

Since the end of the 19th century the KAVB is active in the areas of name-giving (nomenclature) and registration of bulbous, cormous and tuberous-rooted plants. The KAVB has been appointed as international cultivar registration authority (ICRA) for genera like Tulipa, Hippeastrum, Hyacinthus, bulbous Irises, Crocus and Muscari. For the genera Lilium, Narcissus, Dahlia and the large-flowered Gladiolus the KAVB has been appointed as national cultivar registration authority (NCRA) and assists the ICRA with registrations.

With registration the description of a cultivar is linked to a cultivar name.

The proposed name will be checked using the latest edition of the International Code of Nomenclature for Cultivated Plants (ICNCP) and the "UPOV Recommendations on Variety Denominations". The latter is a document issued by the International Union for the Protection of New Varieties of Plants (UPOV) convention. This convention is signed by countries with Plant Breeders Rights.

Plant Patent in the U.S. and trademark registers will also be checked to ensure that the proposed name is available.

Registrations will be published in our journal "Greenity", in the database on this website (Database Siergewassen), in the Classified List and International Register of Tulip Names, in the International Checklist for Hyacinths and Miscellaneous Bulbs, and in the international registers of Lilium, Dahlia, Narcissus and large-flowered Gladiolus.

To register a new cultivar the registration form, duly completed and including a colour photograph, should be returned to the KAVB. A guidance on completing the registration form can be found here.

It would be appreciated if some bulbs or tubers of the cultivar to be registered could be sent to the KAVB to be planted in our Trial Garden

Registered cultivars

The database Siergewassen contains details of registered cultivars and botanical species with descriptions, registration details and pictures.

Granted Dutch and European plant breeders' rights for registered cultivars are incorporated. You should investigate the most up-to-date situation on the websites of the Dutch and European Plant Breeders' Rights Authorities yourself.

We bear no responsibility for any damage whatsoever as a result of the presented data.

You can search in the following fields: genus, species, cultivar group, cultivar, registrant and registration date. The search results can be sorted alphabetically.

You can also combine multiple queries. When you select PBR NL the registered cultivars are shown which have been granted PBR (active or ended). Proposals and rejected PBR are not shown. The search results can be sorted alphabetically.

Search Siergewassen

For questions and information you can contact Saskia Bodegom,