The normal planting method, 4 rows on a bed gives the best result for many varieties, but for very vigorous varieties like ‘Apeldoorn’ the yield of saleable bulbs can be increased by using a new method on double ridges. Tulip bulbs, cvs Apeldoorn and Danton, planted in 2 double rows on a double ridge, gave similar or greater yield than tulips growing on beds [Rasmussen