Reblooming on the same spike?

[solo1979]

What's the trick? I've read how to do it, cutting the spike back about halfway once it has stopped blooming, but everytime I do that, the whole thing just continues to dry up. On my visit to Oak Hill Gardens today, I saw a bunch of them that they had done this too and got a new spike to sorta branch off the side and bud. So, what am I doing wrong? I don't find this look very visually stimulating, nor would I ever purchase a plant reblooming like this, but I'd at least like to try it.

Solana