When a triploid is pollinated with pollen from a diploid (triploid x diploid) , or a diploid is pollinated with pollen from a triploid (diploid x triploid) or a tetraploid is pollinated with pollen from a triploid (tetraploid x triploid) or a triploid is pollinated with pollen from a tetraploid (triploid x tetraploid) the process will begin the same way as for diploid x diploid crosses or tetraploid x tetraploid crosses. A certain percentage of the crosses will "take" - that is the petals and sepals will drop off and a pod will start to form and grow larger. The pod will look good and grow larger for as many as seven to ten days and then usually dry up and fall off. A few pods may stay on the plant and continue to get larger for several more weeks but then dry up and fall off. Very rarely a pod may stay for as long as five weeks and have a viable seed.
Stout cross-pollinated 7,135 flowers of the triploid 'Europa' ditchlily and produced 23 pods that survived to maturity. At the time he wrote his report he had managed to produce only eleven seedlings. Using the pollen from 'Europa' on diploid daylilies was slightly more successful.
