Answer: Yes, both tulips and lilies will produce offsets from the original bulbs. You can leave them alone and they will eventually produce a large population of bulbs in the bed. I'd plant them about 6" apart (4" apart for the tulips). You can dig holes, add 3-4 TBS of bonemeal to each hole and then plant the bulbs. After planting, spread several inches of mulch on top of the soil to help suppress weeds. I wouldn't mixt potting soil with garden soil and then plant; the potting soil will decompose after a while and your bulbs will sink. If they are too deep in the soil they won't bloom. So, just plant them in your regular soil without adding potting soil.
Enjoy your beautiful flowers!
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