Can anyone tell me what this plant is called?

This is such a  lovely plant. I’d really like to know what this is. My neighbor told me this plant only bloom once every three years which could be the reason I haven’t noticed them until this season. It’s a shame these flowers* don’t last-longer casue as you can see they are so eye-catching. I noticed they were only in bloom abnout 10 to 12 days and now only the green leaves* are left.

Please share what you think they could be so I can look it up and learn more about this plant.    

Purple plant mystery

Thanks so much and keep rockin, Monica