Well, here's how we do it - may not work for you but LSA uses Miracle gro occasionally. Usually takes a couple years to get a more than a handful of blooms, splitting when they get too crowded does help in getting them to bloom. Pinching off the blooms after the flower starts to shrivel is a good idea, also picking off any of the seed pods. Pulling off the leaves when they turn brown, yep we're doing that already. Hope this helps.
Thanks. I just have to keep reminding myself to be patient. They will likely bloom better next year. The soil is pretty crappy...mostly clayish kinda stuff. So I hope to have some good home grown compost to put on 'em.
I'm not as concerned over the ones that haven't bloomed a lot as I am over the ones that haven't bloomed at all. But then again, I have no idea what kinds I actually planted...some from Nana, some from the store, so they may yet bloom.