Tiger lily seeds or bulbils. Mine never have gotten a pod, to give me seeds. Get plenty of bulbils and most of the bulbils have stopped growing that were planted last year. They don't tend to get to big first year out, though some will produce bulbils. Most will grow one leaf at a time instead of having that little tuft of 4 or 5 leaves at the top of the plant for each growth stage. A couple of the bulbils from last year have grown tall with standard number of leaves per stage, but very doubtfull they will bloom this year. Again not sure what growth pattern to expect from a seed, but I wouldn't think it would be better then that of a bulbils growth.

an illustration of standard growth

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a one leaf per stage looking plant, which seems to be the norm for first year.

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This is how the bulbils look like (the black spheres):

And this is the flowers: