This is Crocosmia crocosmiiflora often called Montbretia. It is almost impossible to get it out of the garden,once established. I would never bring it into my garden. Al

It can't be any worse than Lucifer and it's much bigger- doesn't seem to spread like Lucifer either. Hope it continues to bloom well.

Crocosmia crocosmiflora is not bigger than Lucifer.

If the colors in the picture are true, I can say that it looks very like my Star of the East. This is a great crocosmia for the deep south and does not spread invasively.

Tall plant and well-branched would indicate Crocosmia paniculata or some hybrid thereof. Not sure of 'Star of the East' - although the right genetics apparently, coloring of that cultivar is more of a true tangerine orange (no gradual fading) and with very large, flat flowers.

I might guess 'Zeal Giant'.