Jerusalem Artichoke?

That's what Google comes up with. Is it really a Jerusalem artichoke? Seen in the Middle Gardens when I went to meet Mr B after tennis.

Had coffee with him, G and wife N. They fancied Flirt Cafe, but loud band playing outside in the Triangle. Couldn't hear ourselves speak. so we went our favourite, Blend on the Hill instead - had coffee and sourdough, mine with tempeh, hummus, red onions etc.

Became more humid, so returned home after