Finish an Era with a Village of 150 Prosperity using Plants and Minerals
The two most important plants for you to know about for this challenge are Strawberries and Blueberries. Through the combination of these two plants you can easily ace this challenge using only plants (which means this solution doubles up with that of the Agriculture Development. Two birds, one development).
Ocean Giant, make and ocean. Forest Giant, make a forest. Now what you need to do is use the Forest Giant’s plants, and only the Forest Giant’s plants. Start with pure blueberries; try and goad the settlers into making an all food project.
Once the Project is underway, focus on creating plants in this order; Strawberry, Blueberry, Blueberry, Strawberry (the Strawberry is the 'Leaf Aspect' transmutation of a Blueberry). When adding aspects to your leaves remember to use the Forest giant’s Fertile Ground to make the aspects potent.
Aspects are used on plants to upgrade them but it’s important to understand that an aspect can be applied to a plant simply to buff it. By using the Forest Giant’s Fertile Ground ability you can add Potent Aspects to your plants, adding extra resources to thei output. Choosing not to do this just makes things harder for yourself for no good reason!
You want to be adding two Potent Leaf Aspects to your Strawberries and one Potent Fruit aspect to your Blueberries. The Leaf aspects will boost the Natura of the Strawberry and its surrounding Tiles, thus activating the Potent Fruit Aspect’s extra Food output from having enough Natura on the Blueberries tile.
Simply continue like this for as long as necessary and you’ll easily exceed the necessary 150 prosperity using plants alone.