Dahlia australis
30th June 2016
I was given a plant last year and it has grown quite tall in a large tub in the greenhouse but flops over in the warmth.
Outside it would probably be sturdier, and it stands a good chance of being hardy.
Larger flowers than D. merckii though not distinctively so in my plant (doubts have been cast over its identity as a result).
2nd November 2017