Depends on what you are trying to accomplish Matt. There are good reasons to cut or not to cut depending upon the health and age of the plant. With weak or young plants it is often a good idea to cut the spike completely in order for the plant to focus on rebuilding its leaves and root system instead of pouring energy into more flowers. Also as noted above - each progressive blooming tyically has smaller and/or fewer flowers (though not always). Some people, like myself, don't particulary like the aesthetics of subspikes and supspikes of subspikes and would just as soon have the plant get bigger and better and produce a pristine new spike next season to enjoy. Some folks don't ever cut the spikes off until they brown. Some folks cut them at the base immediately. Some trim at different nodes for various reasons - the choice is always yours! Enjoy!
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