@oldfatguy - If you haven't already put in stakes for them, I would recommend it now before the tubers start growing and expanding. You don't want to pierce them when you stake them. And.....at 3" deep, staking is going to be important. Thats assuming these are full sized dahlias that can get 4-5 ft. tall. (or taller if not full sun)
I think we have all learned lots from the other gardeners on this site. Its what makes it work so well.
