Question of the Day: Are green bell peppers sweet?
Quick Answer: Some green bell peppers are sweet, and some are not.
All immature bell peppers are green and have a bitter edge to their flavor. It is only when they ripen that they become sweet. That is why red bell peppers are generally considered sweeter than green. They are fully matured.
However, there are some varieties of bell peppers that do not change colors. No matter how long you leave them on the plant, they will stay green. This means it is possible to get fully ripened (sweet) bell peppers that are green.