Acorn

Acorns are used to plant trees. There isn't too much known about the growing of trees yet, but it seems to be at random (when certain conditions are met). Acorns can only be planted on grass. Grass must be cut back on at least one side in order for saplings to grow into trees, as there must be space for at least one of the two roots, and there must be 2 tiles of space on each side for branches (optimal planting every fifth tile). Acorns are randomly obtained by cutting down trees or purchased from the Dryad.