Tree



Trees are structures of wood and leaf blocks, created when a map chunk is generated or grown from a planted sapling. They are found in most biomes, and abound in forest-related biomes. Tree growth was added to Alpha in 0.0.14a and Creative in 0.28_01.

Structure
Their natural height varies widely, from a minimum of 5 blocks (4 wood and 1 leaf) up to 16 blocks (13 wood and 3 leaf). Rain forest biomes favour larger trees.

The tree canopy is composed of leaf blocks, and grows 1–3 blocks higher than the highest wood block. The canopy may begin as low as 1 block from the ground (for a tree with a 4-block trunk) up to 6 blocks from the ground (for the tallest trees). Tree canopies appear to be generated from roughly spherical clusters of leaves about 5–7 blocks across, centered on sections of trunk or branches. Leaves must be supported by adjacent trunk or leaf blocks, or will wither and disappear.

Any normal tree with a trunk height of at least 4 has a chance to grow branches (wood blocks connected horizontally, vertically or diagonally to the trunk or other branches). A single tree may have between one and six branches, and each branch may have between one and six wood blocks. This provides a maximum of 43 wood blocks per tree, though this is very unlikely to happen naturally since most branches are about 3 blocks long. Branches support a much larger canopy than a tree with a single trunk. Birch and redwood trees cannot grow branches.

Sapling growth


Trees can be grown from saplings, which have a 1/16 chance of dropping from leaf blocks when they are destroyed or decay. Some players harvest wood from high-efficiency tree farms.

As of Beta 1.5, saplings now occur in three separate varieties corresponding to oak, silver birch, spruce and pine trees.

The sapling must be planted on a dirt or grass block. The sapling must have at least 4 blocks of space above it, and a light level of at least 9 in the block directly above the sapling (making the light in the sapling block at least 8, depending on torch placement). A sapling will uproot with light level 7 or less in the sapling block itself unless it has an unobscured zenith (except by glass or other fully transparent materials). All trees in a large radius around the player make attempts to grow at random intervals. For any given tree this can work out to about 3 attempts per minute, but a tree will usually not grow until nearly 30 minutes have elapsed since planting. When the tree attempts to grow it first checks that it has enough light, then chooses either to spawn as a Large Tree or a Small Tree. Large Trees require 4-14 blocks of open space directly above the sapling to grow (Air or Leaves only) but can otherwise be completely enclosed on all sides (which allows for the phenomenon of 'Tree Tubes'). Small Trees require no horizontal clearance at the base, 1 block around the main trunk, 2 blocks from the top of the trunk up to the ceiling and 6-8 blocks of vertical clearance (Thus a Small Tree can grow in a 1 deep hole, but not a 2 deep hole). Now that the tree has passed a light check and chosen a type of being either Large or Small, it checks if there is space to grow into what it has already (randomly) chosen to become. If it encounters an obstruction during this check, it fails to grow and must wait for the next pass before it can attempt to grow again. This means that a tree in an open field with enough light will grow quite quickly (usually right around the 30 minute mark), but a tree in a tree farm that stunts its size may make several attempts before finally growing. Bone Meal forces for the tree to grow if right clicked as long as all of the normal checks are in place (i.e. light, space, dirt, etc.).

Growth notes

 * Growing trees are not blocked by leaf blocks.
 * Leaves of small trees will destroy fences, glass, paintings, stairs, and torches due to a mismatch between the tree's actual and test forms.
 * If there is a ceiling above a sapling, this will limit the maximum height of the tree that can grow from that sapling.
 * A large tree form exists with a single leaf block layer above the minimal 4-block trunk, allowing a tree to rarely grow in a vertical space with a height of only 5, but otherwise the maximum trunk height is 2 less than the vertical space, making the practical minimum height 6.
 * Saplings will grow normally in The Nether, although it must be planted in dirt from the normal world.
 * If you are standing on a sapling when it turns into a tree you will be trapped inside and begin to suffocate. You can escape by digging.
 * Bone Meal does not guarantee a tree will grow, but forces it to attempt to grow. The tree must pass all normal checks, including light level before it grows.
 * While tree trunks will not grow through solid blocks, the branches of large trees can grow through (replace) any blocks that are not directly above the trunk.
 * Since Beta 1.5, and it has been possible to plant Birch trees, it seems like they grow faster than normal trees. A Birch tree has been seen growing from sapling to fully grown tree in under 1 day. It looks like they skip the 30 minute delay entirely, in very rare cases they even grow within one minute. This has been reported for SSP and SMP.
 * It seems like pine and birch trees only have a very small chance of dropping saplings.

Types/Biomes
With the Beta 1.2 update two new tree types were added.

So far the tree types include regular trees (oak), birch trees, and pine/spruce trees. Pine and spruce share the same wood type but look slightly different. Spruce trees have leaves that extend all the way down the trunk, whereas pine trees have leaves that reside only near the top. Birch, spruce and pine trees are fairly uncommon compared to regular trees. Birch trees stand out due to their white colored bark, and pine and spruce trees have blue tinted leaves that usually grow in more than one row on a tree. Pines/Spruces grow only in snow biomes. Both tree types behave in the same way regular trees do, with saplings and wood blocks, and leaves. Different types of wood blocks cannot be stacked together. More tree types may be added in the future.

In saves before the beta 1.2 update it is possible for a tree to be generated with different colored leaves due to biomes intersecting over the tree.

Uses
Tree harvesting is an essential first step for any player in Survival mode. The wooden blocks can be harvested for wood, without requiring tools (although an axe quickens harvesting). Each wood block can be crafted into wooden planks and sticks, which are used for crafting tools.

Wood can also be turned into charcoal, an equivalent of coal.

When leaves are harvested, or decay naturally, there is a chance they will drop a sapling, which can be planted to grow a new tree. Destroying leaves does not require a tool; however, a sword destroys leaves negligibly faster, but this quickly degrades the sword.

Trivia

 * Since the 1.2 update, trees in pre-1.2 levels will have leaves of different colors and even pine needles.
 * Big trees have a higher chance of appearing in the rain forest biome.
 * Big trees are also referred to as 'Great Trees'.
 * You can grow a tree on top of a tree by placing dirt on the top of a tree and planting a sapling.
 * If a sapling is planted on a block directly above or adjacent to lava, the resulting tree will immediately catch fire.
 * Trees will only grow if they are planted on a chunk of the map that is loaded into memory. If you plant saplings and then explore another more distant area of your world for a few Minecraft days, they will still be saplings when you return.
 * Before beta, trees could destroy glass if their growth would occupy the same space.
 * Birch and pine trees were introduced in Beta 1.2.
 * Skeletons and Zombies can survive daylight if they are under a tree.
 * It seems with the addition of different types of lakes above ground, you may have floating trees. This happens since the tree is spawned when the chunk loads first. Then, the lake is spawned afterward. This leaves the tree floating above the lake.
 * If a sapling is surrounded by a 2 block tall tube it guarantees that it will, eventually, grow into a big tree. The tube forces the small tree growth to always fail each attempt. However, this takes far longer to produce a mature tree, due to the low chance that a sapling will try to grow into a big tree.
 * If a sapling is surrounded by stone on all sides 4 blocks from the ground, the sapling will be 4 blocks taller then it would otherwise. This can be repeated with rings or giant vertical tunnels though rings every 4 blocks. Tunnels are easiest underground (because you can tunnel all the way to daylight (so you won't need torches) while rings use less blocks above ground. This is because the sapling thinks that the stone is the ground.
 * Once a tree(average size) has been ignited it will take roughly 20 seconds to completely burn away.
 * Even if the minimum distance between 2 trees is two blocks of air, if one is ignited then the other will soon catch fire as well.
 * Post-Beta 1.5 regular-type saplings (i.e. not Birch or Pine/Spruce) will not stack with pre-Beta 1.5 regular saplings.
 * Contrary to popular belief, an already spawned tree will not grow further wood or leaves.
 * If a tree grows underground in SMP, most of the leaves may not appear instantly, but will "grow" out over time. Any players colliding into the soon-to-be blocks will get stuck/snagged until it becomes visible. This snag can even happen before the sapling sprouts.

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