believe mine did as well..not sure since I have never had one flower but they did look like bright purple tassles hanging there the other day and no new shoots this year.

Over the last 15 years I have had about 5 bamboo species flower out of my collection of about 80. None of them survived. I understand that there are a few bamboo that do seem to flower without biting the dust, but I've yet to experience that. I have not had Pleioblastus flower, so I can't speak specifically about that one. What will happen will happen, and I doubt that cutting it back will alter the outcome, whatever that is. But good luck. Please report back if the plant survives.