Bulbous Plants
The main bulbous crops (the ones with more than 100 ha bulbs in the NL in 2012) grown in The Netherlands are tulip (Tulipa) (9963 ha), lily (Lilium) (3941 ha), hyacinth (Hyacinthus) (874 ha), Narcissus (1545 ha), Gladiolus (684 ha), Iris (260 ha), Crocus (352 ha), Allium (189 ha) and Zantedeschia (126 ha). The acreage in hectares as published by the Dutch Flower Bulb Inspection service (BKD) is given between brackets.
Some aspects of research on Tulipa, Lilium, Narcissus, Hyacinthus and Zantedeschia carried out in the ornamental breeding group are listed below.

Research in the ornamental Breeding Group of Wageningen UR on tulip is focussed on introgression breeding of virus resistance from T. fosteriana in T. gesneriana (TTI-GG; Marasek et al., 2011).

Tulipa cv World Favorite                                               Ile de France

The history of the lily assortment is relative short.The first commercial group of importance is the Asiatic hybrid groups which were used on large as cutflowers in the 70 and 80ties of the last century. The second group is de Oriental hybrid group which became important in the nineties. Through the use of pollination, embryo rescue and polyploidization techniques the LA- and OT-hybrids were developed. The cultivars of these groups are all triploid and changed the assortment od lily dramatically (Van Tuyl and Arens, 2011; Lilium Symposium).

   OR lily Tessa LA Brindisi

The origine of the most important Narcissus cultivar "Tete a Tete" has been proved by Genomic in situ Hybridization research (Van Tuyl and Arens, 2012; bulb symposium Turkey, Wu et al., 2011).

Range of ploidy levels in hyacinthus cultivars (Van Tuyl and Arens, 2012, Bulb Symposium Turkey).