Lyn, I have not grown in containers but I would imagine a soil rich with compost would do. I use a l0-10-10 fertilizer on all my plants which includes daylilies, columbine, black eyed susan, snapdragons and they seem to do fine. I do know that plants in pots tend to dry out quicker so you have to make sure you water them more often. We don't get a lot of 90 temps here unless we are having one of those extremely hot summers which happens here about once every 3 to 4 years. It actually has been quite cool here this spring. I have had fairly good luck with heuchera's except for two that I lost. I haven't been able to grow Snow Angel, have lost that one twice. I also lost, can't remember the name, but it had an extremely red flower on it. That one did last a couple of years and I guess our winter killed it off. I love them and would eventually like to get more if I can let go some of my daylilies, which is hard for me to do, lol.
