Nobody has grown a geranium successfully and wants to suggest advise?

Still nothing? Let me throw my two cents in and then I'm sure someone else will suddenly need to chime in to correct me.

I think a little more generous watering and feeding might get its vigor up enough to bloom, yet won't overdo it so much that it's all leaves. I think the stellars are sometimes a little poky about blooming, but when they do it's a nice flush, so worth it.

Have you been using the floor dry for a while? I tried something similar one year when repotting my amaryllis and they were NOT happy. I can't say for sure it was adding the clay product, but they were anemic and stressed looking for about a year until I repotted again. Other plants didn't mind, but they suffered and I suspected some kind of pH or salt overload.

Well it was outside all summer (which here is April through Nov) and got watered about the same amount as impatiens (I say that because some impatiens self-sowed in the cactii near it)...it should have had plenty of water. I did keep it on the lean side, because I understood geraniums were prone to all foliage and no flower if over-fertilized (plus I'm not much of a fertilizer either, heck I'm lazy). I can throw some more fertilizer at it this winter (inside).

Yeah, after seeing the Al 1:1:1, I bought some...25 lb bag..nearly all gone now. Hmm...points to ponder. I don't use it on everything, just things that seem to want a bit more drainage. It's also probably a 10-20% in the geranium pot. What would you use to compose a geranium soil, seems pure peat is not recommended?