Peppers not flowering is usually due to a couple of things or both. Peppers need sun….6-7 hours minimum and more is even better. Also, they need a plant food that provides plenty of Phosphorus (the middle number). If they are fed with a general purpose food (20-20-20 for instance) or a food high in Nitrogen (the first number), they will produce lots of leaves but not flowers. Start feeding every other week with a soluble plant food like Jack’s Blossom Booster (10-30-20) and, with enough sun, they should start producing flowers. Also, when watering, water just the soil below the plant, never spray the plant with water. Peppers like to get pretty dry in between watering so don’t overdo it.