Set Sheath

How to remove faded flowers from a Canna flower spike ...?
Hi - can anybody please advise me how to remove a Canna flower spike once the blooms have faded. Do I cut it right back to ground level or do I cut it elsewhere on the spike. Have tried to do a search but have found conflicting advice - some sites say that the spike should be cut back to ground level others advise to only cut back to the next set of buds contained within a sheath - not sure about this one - specific advise would be needed as this is the first Canna I have ever grown.
Many thanks!!
http://faq.gardenweb.com/faq/lists/canna/2003034130028952.html
http://www.plantanswers.com/parsons/CANNA.htm
the stem on the left there shows how many flower could show up there.... removing each batch as it 'finishes' will keep the plant looking 'well dressed'... but like the site says, it's not a big deal if you don't.....
this site...
http://laptopgardener.com/?cat=4
"Many annuals (and quite a few perennials) must be deadheaded to keep them blooming longer. Notorious are Antirrhinum (Snapdragon), Canna (only remove the spend flowers and be wary of cutting off future flowers lower on the same stalk),
I don't bother mine until the whole stem has finished flowering, then I cut it back as close to the ground as I can.....
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