You don't - leave the stems to die back naturally, them pull them off when they come away easily. If they're in the ground, make sure you mark where they are.

That's assuming they are true lilies (Lilium species), there are many plants called lilies, and many have different requirements.

Yes - I thought of that when I answered - but I asssumed...possibly wrongly! It's a guest, so we may never know. :-(

True. No criticism intended, Spritz, but I figured that our Guest should know that, too.

Guest, you might want to join (it's free) so we can get descriptions or pictures to help us to be sure of giving you good advice!

You are right, Tug. I didn't take it as criticism...:-)

Wheww! Good!

:-)