Answer: I apologize for the delay in answering your question.
Lilies grown from bulbs (Lilium) bloom only once per season. Once the flowers fade most gardeners will remove just the blooms so that the plant will not direct any energy to setting seed and will instead rebuild the bulb's strength. it is important to leave the foliage intact as it produces the energy for the bulb.
With daylilies, hemerocallis, there are some varieties that will bloom more than once a season in a cyclical way. The stiff bloom stems (scapes) can be removed by cutting them at the ground level once the flowers fade. The plant will produce new scapes from the base of the plant later if it is going to rebloom. Once again, however, it is important to leave the foliage intact and in place so it can build the plant's strength.
In general, healthy foliage is always best left on a plant during the growing season; but anything that is discolored can be removed. In the fall, after frost has discolored the foliage, go ahead and remove it.
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