I know nothing about dahlias, but I fancy growing some this year to enter in
the local village show, but only for a bit of fun, nothing serious.

Is there a difference between exhibition dahlias and dahlias that you buy at
the garden centre (such as the Taylors' bulb packs), or does it not really
matter?

I know it's only for fun, but I don't want to look too much of an idiot!

Thanks.