Prune flower stems on fortnight lily?

My fortnight lillies appear to have stopped blooming for the season. Should I cut back the flower stems? See http://www.softadventure.net/gardeningplantID.htm
HH
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HH wrote:

Only cut those stems that are truly dead. During the next bloom period, new flowers will come from the existing stems that are still alive.
--

David E. Ross
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