User blog comment:TheScottBird/I Need Some Help/@comment-24145588-20141006175334

Good point, Gp-mom. When I suggested that Unity Trees might be a better investment than Mini-Mines, I probably should've made it clearer that it only applies to populated islands. If you're just unlocking the island and haven't started populating it yet, then the Unity Tree of course won't do anything for you.