How do you get villagers to master dendrology on Virtual Villagers 4?

Answer:
You use tech points. Go to the tech screen and look above the stone painting of the tree. Above it is the dendrology tech. If you have enough points, press buy to get level 2, then buy again to get level 3.
First answer by Futurezooowner. Last edit by Futurezooowner. Contributor trust: 25 [recommend contributor recommended]. Question popularity: 74 [recommend question].