Here I am thinking going for my own Dalhia type is lofty. We get so many requests for blues
Discussion
Iโm a big fan of endless summer hydrangeas for blues because theyโre pretty easy to get there with some used coffee grounds. Iโve never seen a truly blue dahlia but Iโve seen purple ones
We grew Edisons (I think that's what it's called) last year they are dinner plate variety last about a week in vase. 
Do you grow any of those stripy dahlias?