I started growing two Serrano pepper plants in spring. One of my pepper plants produced two peppers but that is it. Both of the plants are about 25 in tall and blooming like crazy. But when the flower falls off so does the whole immature pepper. I stopped feeding my plants nitrogen fish fertilizer a while ago, and feed them 5 4 6 fertilizer. I tried putting one plant in the shade and the other in the full sun for a couple of weeks, yet the problem persisted. I also hand pollinated each flower. I don't water too much or too little. All my other peppers are doing great, the fushimi, cachucha, habanero, ghost, jalapeno, red bell, Jimmy nardello, Thai, poblano, and lunch box red. It is just this little pepper I cannot figure out!!!