A Birchnut is an item dropped from Birchnut Trees or Birchnutters in the Reign of Giants DLC. Like Pine Cones, Birchnuts can be planted to create a new Birchnut Tree. Birchnuts spoil over time and are only edible once cooked over a fire. It takes from 7.5 to 10 game hours for them to grow from saplings into small trees.
It should be noted that chopping down anything but a Large Birchnut Tree will not provide any Birchnuts. Chopping a Large Birchnut Tree during Autumn will provide an additional Birchnut, but chopping one during Winter will give none at all.
Planting Birchnuts can calm and put to sleep nearby aggressive Poison Birchnut Trees, in the same way planting Pine Cones can calm Treeguards. The chance of this happening is a maximum of 33% when planted near the tree, with a lower chance when planted further away.
Instead of being used as fuel like Pine Cones, when put in a fire, Birchnuts will become edible Roasted Birchnuts. Roasted Birchnuts can be used in the Crock Pot as filler and are a key ingredient in making Trail Mix. It is recommended that Birchnuts are kept raw and only cooked when ready to eat, as they will spoil much faster once cooked. Unlike other Foods, roasted birchnuts can't be given to the Pigs.