It’s a very distinctive dahlia - not like other dahlias - it’s very wirey and over 2m tall with small orange flowers. I grow lots of regular dahlias but this one is different, many thanks
I think it could be dahlia coccinea strain, for example Dahlia Coccinea Mary keen can grow upto 2 metres I don't think its Mary keen though its not red enough.
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https://www.cgf.net/plantdetails.aspx?id=5349