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Yes as long as you get the roots too, when you dig up the lily they re usually in clumps, follow the stalk and get the roots that are with it. Then you can replant it where it you want it. Most of the time I take 2 or 3 stalks from the mother plant and move them to their own space. Karen, yes you can plant the stem without roots, but it is not as predictable as the other methods. I wouldn't recommend doing it outside unless you live in a moist area. Using rooting hormone and keeping the sand or soil moist, you can propagate using the stem.
Lilies in general, either species or cultivars are self sterile. This means they will not produce seeds if their own pollen from the anthers is placed on the stigma. Because of this cross pollination is the only way seeds can be produced.
I have no idea what types of cultivars they are. They usually just come in somewhat generic bags of 10 to 12 bulbs. They tend to do well here until the really hot weather arrives, then they die back and become dormant. Sometimes, as happened this year, green shoots will appear in the late fall or early winter. They quickly die back again at the first freeze.