Some daylily varieties are diploid (2 sets of chromosomes, like the original
wild ancestor) while others are tetraploid (4 sets of chromosomes, created
by manipulating daylily seedlings or tissue with colchicine).
There are a few triploid daylilies which are sterile so will not set seed.
Be sure you are crossing diploid to diploid and tetraploid to tetraploid,
otherwise you won't get fertile seed.
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