New Atlantis is the main hub of Starfield, and it's the first city most players will visit. It's full of all kinds of activities, encounters, and side missions, including the mission chain that starts with "A Tree Grows in New Atlantis."
Starfield: A Tree Grows in New Atlantis Walkthrough
Starfield's A Tree Grows in New Atlantis quest tasks players with helping a xenobotanist named Kelton solve the mysteries surrounding a strange tree.