I just bought the same plant today at Lowe's in their clearance section for $2.50. I don't believe that 'Clasificado' is the name of the cultivar, as I looked it up on Lowes' website for more info and it just lists it as Dahlia. I got the specific plant # off the plant tag from Lowes (L3480). Unfortunately, I think this is pretty typical of plant labeling for a big box store. :(
Sorry that I couldn't help more, but I'm in the same situation as you are. It was a good deal for $2.50 so I'm not complaining. It would be nice to know the specifics though.

Here is a link that might be useful: Lowes.com/Plants

Jeez...just noticed that the original posting was from 2005! :( If the original poster sees this, how is your dahlia doing?

Hi goldennail,

I saw this plant in Lowe's yesterday. I liked it a lot but decided to look for some info online before buying. Couldn't find anything. How is your plan doing?
The label says "blooms spring to summer". Does it mean - spring through summer?

Thanks