Tree Simulator

The Tree Simulator grows and harvests a resource tree inside a single block. Put a sapling and an axe in it, and it produces logs, leaf fragments and saplings on a timer, without growing a tree in the world.

Crafting

Exact shape ➜ Tree Simulator

The menu

Tree Simulator41321234

1. Sapling: any resource sapling with a Tree Simulator recipe.
2. Axe: required. Better axes finish each harvest sooner.
3. Progress: fills once per harvest.
4. Output: nine slots. The simulator pauses when a drop has nowhere to go.

How it works

1. Put a resources sapling in the sapling slot. It is never used up.
2. Put an axe in the axe slot. Nothing happens without an axe.
3. The progress arrow fills over the sapling's grow time, shortened by the axe.
4. When it is full, the simulator rolls the sapling's drops into the output slots and the axe loses 1 durability.
5. The cycle starts again.

If the output slots can't fit every drop of the next harvest, the simulator waits until you empty them.

Default drops per harvest

Every sapling gets these drops unless a datapack replaces its recipe:

Drop	Chance per roll	Rolls
Log of the tree type	30%	1
Leaf fragment	100%	1
Bonus leaf fragment	leafDropChance × 0.5	1–4
The same sapling	saplingDropChance	1

The Sapling Explorer works these out for any sapling and axe, including averages per hour.

Axes

The axe sets the speed. Each harvest takes the sapling's grow time divided by the axe's multiplier.

Grow time 800 ticks1000 ticks1200 ticks1400 ticks1600 ticks1800 ticks2000 ticks Efficiency None12345

Used by Iron, Copper, Gold, Lapis, Obsidian, Bee, Slime, Skeleton, Spider, Chicken, Cow, Rabbit, Squid, Turtle, Blaze, Breeze, Gunpowder, Ghast, Pig, Sheep, Fish, Zombie.

Axe	Multiplier	One harvest
Wooden Axe	×1	60 s 1200 ticks
Stone Axe	×2	30 s 600 ticks
Copper Axe	×3	20 s 400 ticks
Iron Axe	×4	15 s 300 ticks
Diamond Axe	×5	12 s 240 ticks
Netherite Axe	×6	10 s 200 ticks
Golden Axe	×7	8.6 s 171 ticks

Any item that can strip logs counts as an axe, including axes from other mods. An axe that isn't listed in the config works at the base grow time.

Enchantments

Enchantment	Effect
Efficiency	Each level shortens a harvest: the time is divided by 1 + 0.2 × level. Efficiency V halves it.
Fortune	Each level adds one roll to every drop.
Unbreaking	Makes the axe last longer, as usual.

Axes with the unbreakable component never lose durability. You can also turn axe damage off completely with useAxeDurability in the config.

Automation

Side	Slot
Top	Sapling
Sides	Axe (only accepts axes)
Bottom	Output

A hopper above can insert a sapling, a hopper on the side can keep it stocked with axes, and a hopper below collects the output.

Breaking the simulator

Breaking the block drops the simulator along with its sapling, axe and everything in the output slots.