Compost Pile Upgrade

The Compost Pile Upgrade replaces the Compost Pile with a bigger one that takes 16 Leaves at a time and makes 5 Peat, in five steps of a minute each. That is 5 Peat from 16 Leaves against the old 2 from 8, a quarter more Peat for each leaf. It costs 12 Short Logs, 8 Bronze Nails and 2 Bronze Details, and appears at the garden’s build desk once you have both built the Compost Pile and researched Fertilizers III (60 green, 15 blue), in either order.