I agree with Dillard...bells are slow. I have gone to mid-season varieties since the long season bells don't begin putting out fruit until the possibility of frost is looming. I have stopped trying to get Cal Wonder to produce in my short pepper season. I get green but not ripened peppers. All my peppers get about a two week early start compared to tomato seeding. Mid-February seed starting as compared to first of March, and I am in 5B or 6A.
You say you have fertilized your peppers. Like tomatoes, nitrogen fertilizer will give lots of green plant but no fruit production. Use a "bloom buster" fertilizer (like 8-30-30, low N, higher P and K formula) which helps roots and fruit. In containers you need to replenish nutrients every ten days or so as watering flushes out nutrients. I add water soluble fertilizer to the water once per week. Mine are all in-ground so I do not fertilize unless the plants are under stress and need a shot.
