I have had measured success with green peppers. They need full sun and moderate watering. They tend to be heavy feeders, so you need a balanced fertilizer (Nitrogen/Phosporous\Potassium fairly equal), but you need to be careful as far as over fertilizing. I rotate placement in my garden and do not fertilize at all, but I think I have rich soil. I plant mine right next to my tomatoes and do well. Though I have read you should not plant them in the same spot as the previous year's tomatoes. I don't get the large peppers like you see in stores though. They're mostly the size of my hand. I have noticed bell pepper plants are very susceptible to the weather. Mulching is key to keeping them happy and even watering is essential. Warm temps are necessary, so if you live in a climate you need to start indoors and provide about 16hrs of light per day.<br><br>
I don't know why bell peppers are more tempermental than hot peppers. I grew cayenne peppers this year and they were so easy. They even produced after our first frost. The bells gave up around the beginning of September while the others kept going deep into October.<br><br><br>
Good luck!! And don't give up, just try another angle!