Cross-Pollination
Though peppers are self-pollinating, cross-pollination may occur. Insects, such as bees, or wind may deliver pollen from a sweet pepper to a hot pepper, and vice versa, if they are planted close together. The flavor and appearance of the pepper fruits is not immediately affected when this happens. The peppers develop normally and taste as they should, but seeds collected from these cross-pollinated vegetables may not produce plants and fruits of the same variety. You may find a sweet pepper has spicy notes or the color of the pepper is different than expected