chocolate plant

I think you've got a cosmos - I had 2 last year - unfortunately they died...I don't think they liked being left out in the winter. The flowers really do smell of chocolate. They grew quite tall - 18" or so, with little chocolaty flowers at he tops of the stalks.

Cosmos comes from Mexico and will not tolerate cold winters. In milder parts of the UK (zone 8-9), we can get them through the winter by giving them a dry mulch to protect the roots from the frost. They never really go dormant so will not take prolonged freezing