Classification Numbers

ADS (registered) dahlias are assigned a 4-digit classification number, depending on their size, form and
color. The formula used for assigning the numbers may seem a little complicated at first, but once you
have a good overview of how it is done, it becomes a great tool for helping growers to identify their
cultivars. The classification number is used when exhibiting in shows. It is also used in documentation,
and by sellers.

More details
Classification Numbers Chart