I bought a new variety of dahlia called 'New Dimension', and tried to look it up under this name. It appears in the database exactly as I found it labeled, but not over on Dahlia Addict, which I normally find to be very well maintained. Question: does anyone know of any alternative names for this variety?

Dahlia 'New Dimension'

It could be it isn't a registered dahlia but a nursery name that made it more widely circulated. That Dahlia Addict may just limit themselves to listing officially registered ones.