Vegetative vigor in leaf, stem, and flower tend to be greater. Breeding possibilities tend to be greater because of an increased number of chromosomes. Diploid Diploid daylilies continue to charm growers with their exquisite flower form, grace, and color. Good pink daylilies are still more prevalent in the diploid ranks. Spider and double daylilies are still more prevalent in the diploid ranks.
Diploid daylilies are easier to cross than tetraploids.
Many diploid daylilies have been converted to tetraploids, thus advancing the tetraploid lines. There are more diploids than tetraploids.