Hi Ivan,
I’m not sure why a musa would produce multiple heads, but one thing I am sure of
Is that's a Musa basjoo, strange it came from North Vietnam though, I suppose basjoo has been cultivated as an ornamental in many different parts of the world.
I was looking on a Dutch forum the other day at a basjoo with multiple heads.
Here it is!
foto ingeklemde bloem van musa • Bananen, canna's, strelitzia's en ravenala
Tony