|Book(s)|| A Game of Thrones (appendix)|
A Clash of Kings (appendix)
A Storm of Swords (appendix)
A Feast for Crows (mentioned)
A Dance with Dragons (appendix)
Garrett Flowers is a bastard son of Garth Tyrell.
A Feast for Crows
When Garrett's father Garth travels to Oldtown to take ship to King's Landing to serve on the small council as the new master of coin, Garrett and his brother Garse accompany him, as Lord Tywin Lannister had promised to find a place for them. When informing Queen Regent Cersei Lannister about this, Lord Mace Tyrell suggests Garrett and his brother are named to the City Watch of King's Landing. However, Cersei, wishing to prevent the presence of another Tyrell on the small council, prevents Garth's promotion by quickly naming Lord Gyles Rosby as the new master of coin.