Level 1: Seed of the Golden Wood (requires Gifts of Lorien) - Creates a build plot which can be used to make a Mallorn Tree. If the build plot is not used in 2 minutes it will disappear. (Only 3 of these build plots may be used at once)
Sam can receive only one upgrade:
Gifts of Lorien - Sam receives Mallorn seeds of the Golden Wood, providing build plots for Lothlórien.
This upgrade can be applied to him through Galadriel's ability Gifts of Lorien.
Sam and Frodo can be used mostly for scouting and supporting. His greatest ability may be Seed of the Golden Wood which provides Mallorn build plots for Lothlórien almost anywhere on the map. To increase his durability on the battlefield you should use his last ability For Frodo.