Hi Slug, under only very rare curcumstances will a Den-Phal rebloom from an old spike. 99.9 % of the time, the spike will just die back. They can, however, bloom again from an old cane that's dropped its leaves. The general practice is to cut the spike as close as you can to where it emerges from the cane. Keep in mind, though, that you're doing this only for cosmetic reasons. You can leave the spike completely alone, let all of the flowers die, let the spike brown and die, and still not cut it. You won't hurt a thing, but most people don't like the look of an ugly brown "stick" poking out the top of their plant.