I have grown a lot of sweet peppers but the sweetest by far was a hybrid called Early Thickset. It made rather small bells that had incredibly thick dark red walls. Karma and Socrates are the sweetest large bells I have found but I no longer grow Karma because of the brittle limbs that tend to break every time we have high wind or heavy rain. Another really sweet pepper is Slonovo which is an oblong pepper with a pointed tip and it also has thick walls. I have not found an exceptionally sweet yellow pepper but I like to plant a few for the variety they offer.
Bill
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