I have a new NOID orchid (of course) Dendrobium with several spent canes, but what really has me puzzle is that the principal spike blooming right now grew from the side of an old, spent spike. I thought only phals did that - are there other plants that will throw out a spike after the principal one is cut back? This particular den has four canes that already bloomed and have been cut back, the fourth one was similarly cut back and then threw up a 24" impressive spike as a pretty amazing afterthought. If this is a common happening, is there any particular care that will improve the chances of more blooms?

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This isn't a great photo, but I think it shows what I'm trying to describe. All the old spikes were cut back and dusted with cinnamon.