Aegon's Garden is located near the arch of the Dragon's Tail. Tall pine trees grow in the garden, which also has wild roses, towering thorny hedges, and a small cranberry bog.
A Storm of Swords
Upon returning to Dragonstone after the Battle of the Blackwater, Ser Davos Seaworth is escorted Aegon's Garden instead of the castle's Stone Drum. The Onion Knight finds Princess Shireen Baratheon at play in the garden with Patchface and Edric Storm. Ser Axell Florent then has Davos arrested for plotting against Melisandre.
Shireen continues to play with Edric in Aegon's Garden every day.
Aegon's Garden had a pleasant piney smell to it, and tall dark trees rose on every side. There were wild roses as well, and towering thorny hedges, and a boggy spot where cranberries grew.—thoughts of Davos Seaworth