Saplings

Saplings is also a game feature of Minecraft.
More information can be found on the Minecraft Wiki

A sapling is a non-solid block that can be grown into a tree.

For additional information, please refer to the corresponding item in Vanilla Minecraft.

Obtaining

When leaves decay, or are broken by any tool except shears, they have a 5.1% chance of dropping a sapling, except for jungle leaves, which have a 2.6% chance of dropping a sapling.

Usage

Saplings come in seven varieties, each of which can grow into a corresponding tree: oak, birch, spruce, jungle, acacia, dark oak, and cherry. In addition, azaleas and mangrove propagules can also grow trees.