The Arboretum Experiment is a feature exclusive to the Hallowed Nights event in Don't Starve Together. It can be conducted at the Mad Scientist Lab, using a Batilisk Wing and a Living Log, and depleting 20 for the player.
The experiment will result in a Totally Normal Root that can be planted to create a Totally Normal Sapling. This will grow into a Totally Normal Tree over time that can be decorated using Halloween Decorations. The Totally Normal Root can also be used as Fire Fuel.
- The Mad Scientist Lab and all related craftable Items were introduced to the Hallowed Nights event in 2018.
- The Arboretum Experiment is the only Mad Science experiment to only have one possible outcome.