Sapling

A sapling is an item obtained from leaves that can be grown into trees. There are 6 types of saplings but, only half of them are on minecraft PE of update 0.7.6: oak, birch, spruce, jungle, acacia, and dark oak - one for each type of tree. Saplings have a 1/20 chance of dropping when leaves are destroyed, except jungle saplings, which have a 1/40 chance of dropping.

Growth
Saplings can grow into trees on any dirt, podzol or grass block, and in any altitude, granted that the saplings are exposed to a light level of at least 9, and have a certain amount of space above them, depending on the sapling type:


 * Oak saplings need at least 6 spaces above
 * Birch saplings need at least 6 spaces above
 * Spruce saplings need at least 7 spaces above
 * Jungle saplings need at least 13 spaces above
 * Acacia saplings need at least 7 spaces above
 * Dark oak saplings need at least 10 spaces above

However, they will grow slower if they have fewer than 10 blocks above the dirt. To instantly grow a tree, bone meal can be used on the sapling. It takes 2-4 uses of bone meal to grow a tree. If there is not enough space required, the sapling will not grow.

Certain trees can only be grown with bone meal and more than one sapling. Dark oak saplings will not grow unless bone meal is used on four saplings placed in a 2x2 square. Spruce saplings and jungle saplings, if placed in a 2x2 square and grown using bone meal, will grow into a large variant of the respective tree.



Trivia

 * If the player stands on the same block as a placed sapling, the tree will still grow over the player, which will cause suffocation.
 * Saplings will not grow on farmland.
 * Saplings can grow without the required amount of light if bone meal is used.
 * Repeatedly planting dark oak saplings in the same spot on the bedrock layer would eventually create a hole into the void. The thick trunk of dark oak trees grows over, or "breaks" the bedrock.