Looks like Plume Popoy. I got some by accident from a neighbour. It loves sun, and is VERY INVASIVE. I 've grown to love the plant for its follage, and although it was too invasive for where it was, I opted to plant it on its own in a seperate area. It can get 6 ft tall, with stalks for seeds ( Like a pompas grass). Mine have not bloomed as of yet. Enjoy