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Spiritualism is a Tier Three technology that can be researched after Archery.

Once researched, it allows you to grow forests on field, fruit, or crop tiles for 5 stars.

It also unlocks forest temples, which cost 15 stars, 5 less than the normal 20 stars, but can only be built on forests. Including the cost of growing a forest, it costs 20 stars.

With Farming, Chivalry and Spiritualism unlocked, you can transform an empty field to a Farm by using Grow Forest, Burn Forest, then placing a farm. This is useful when you want to max out your cities.