I understand your reluctance to open up a new plant forum, if there aren't many people to discuss said plant.
I'm not really a "Dahlia person" myself (in the sense of joining Dahlia clubs and exhibiting at shows). I do like and grew a few, though, so I have now added the new badge to my list! (Thanks!
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I was wondering where one would properly post about them on this site, though, as they are neither a bulb nor a perennial. Thanks for the suggestion to use the perennials forum for that purpose.