Pard is right. And vegetative reproduction also includes:
bulbils (the little bulbs on stems above ground)
stem bulblets below soil surface
natural division of bulbs
scaling (as Pard mentioned)
tissue culture
Basically, vegetative production is anything that does not involve true seed, and even that definition has rare exceptions.
To muddy the water a bit, nature rarely has absolutely unbroken rules. So it is here. There are a few Lilium species, like Lilium formosanum and Lilium philippinense, that are self fertile and will produce seed all by itself.
