Your faction really pushes its concept to the max level ! Very flavorful and I really like that you start moving around a seed but it cannot be moved once it grows into a tree. Here are some thoughts :
Not having a VP marker at all and losing the game when you lose the sacred tree seems like real challenge to balance. It also seems really complicated to care for the tree each turn. You need 3 actions to collect the three ressources, and at least 2 movements to bring them back to the tree. So with a 5 card hand you need to do nothing but these 5 actions during 5 turns to have a shot at victory.
Leaving the choice to your opponents of where to place the source tokens means you will have a really hard time gathering ressources in what will most likely be the heart of ennemy territory.
Is there a reason why this faction is not able to craft ? ( besides from having more place for berry abilities instead of a crafted items box ;) ) This faction is already not fighting for VPs, this is another way it doesn't not interact with the rest of the game. Although I guess it's what makes it really unique as well :) .