What do I do with a pepper plant that flowers but does not produce?

Hi. What type of peppers do you have? Thanks.

Take a small clean watercolor size brush and gently touch the center of each open blossom to collect pollen. (I do this with tomatoes, not absolutely sure it works with peppers, but don't see why not.) Move from flower to flower, gently touching each one in the center with the brush TIP. Then wait and see. We use so many insecticides these days that pollenating insects are in short supply. You would do well to separate the plants, as they might be too crowded when the peppers come on. But may be too late this year. Not helpful to do it while blossoming.

This also works using a Q tip or something similar. You are doing the work of bees and other pollinators by doing this. Happy growing

Hi. You've probably been too nice to them. Tomatoes and common peppers like a good soil, not a great soil - not too much nitrogen and something they can sink their roots into without it being too moist too loose or too compact. They also like the breeze in their leaves and about 6 hours of warm sunshine, not hot. They like evenings to be cool, but not too cold and if it's too hot at night they hate that even more. They are self pollenators, so if everything is sort of middle of the road for them, they'll produce. Spread 'em out next year and see that they have a bit of late afternoon shade. Good luck!