From A Wiki of Ice and Fire
During the meeting between Stannis Baratheon and Renly Baratheon Renly offers his brother Stannis a peach as they are parlaying. As his brother’s hand slides into his cloak Stannis reaches at once for the hilt of his sword - but before he can draw steel his Renly produces …. a peach. Smiling Renly offers the peach to Stannis, promising him he has never tasted anything so sweet. Stannis refuses the peach. Renly advises him,
|“||“A man should never refuse to taste a peach. He may never get the chance again. Life is short, Stannis. Remember what the Starks say. Winter is coming.” ||”|
According to George R. R. Martin:
|“||“The peach represents... Well... It’s pleasure. It’s… tasting the juices of life. Stannis is a very marshal man concerned with his duty, and with that peach Renly says: “Smell the roses”, because Stannis is always concerned with his duty and honor, in what he should be doing and he never really stops to taste the fruit. Renly wants him to taste the fruit but it’s lost. I wish that scene had been included in the TV series because for me that peach was important, but it wasn’t possible.”||”|
In Vaes Tolorro Ser Jorah Mormont gifted Queen Daenerys Targaryen with a peach. When she took the first bite the flesh of the fruit was so sweet she almost cried. Dany ate the peach slowly, savouring every mouthful.
|“||“Renly offered me a peach. At our parley. Mocked me, defied me, threatened me, and offered me a peach. I thought he was drawing a blade and went for mine own. Was that his purpose, to make me show fear? Or was it one of his pointless jests? When he spoke of how sweet the peach was, did his words have some hidden meaning?” [The king gave a shake of the head, like a dog shaking a rabbit to snap its neck.] “Only Renly could vex me with a piece of fruit. He brought his doom on himself with his treason, but I did love him, Davos. I know that now. I swear, I will go to my grave thinking of my brother’s peach.” ||”|
|“||“Renly and his peach. In my dreams I see the juice running from his mouth, the blood from his throat. If he had done his duty by his brother, we would have smashed Lord Tywin. A victory even Robert could be proud of."||”|