Because your Asiatic lilies grow from bulbs, they will need their foliage the rest of the summer to transport carbohydrates (energy) back into the bulb for next year's floral display. If you cut the stalks down too soon, they won't have enough stored energy for next year. Leave them alone until the stalks die back on their own. After that happens you can dig and move them without harming them. As you dig you should be able to recognize the individual bulbs. Just carefully separate them and replant each in its own hole, spacing them 6-8 inches apart. Enjoy your garden.
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