Podzol

Podzol is a dirt-type block that naturally blankets the surface of the giant tree taiga and bamboo jungles, along with their respective variants.

Natural generation
Podzol generates only in giant tree taiga and bamboo jungle biomes, as well as their respective variants.

Post-generation
In Java Edition, podzol replaces grass blocks, dirt and coarse dirt around a large spruce tree when it is grown from 4 saplings.

Usage
Like mycelium, podzol allows mushrooms to be placed on it no matter the light level, which allows the growth of huge mushrooms. Unlike mycelium, saplings, all kinds of flowers and sugar canes can be placed on it normally.

Unlike grass blocks and mycelium, it does not spread to adjacent bare dirt blocks.

Block states
See also: Block states

Java Edition:

Issues
Issues relating to "Podzol" are maintained on the bug tracker. Report issues there.

Trivia

 * Unlike other similar blocks, podzol never spreads to dirt blocks, and it does not become dirt if a solid block is placed on top of it, no matter how long the block remains on top of it. Similarly, neither grass nor mycelium can spread to podzol.
 * In real life, podzol is a type of acidic, infertile soil found in subarctic taiga biomes and pine forests. Podzol literally means "under-ash" in Russian because it contains a layer of ashy soil that has been drained or leeched of nutrients. This explains why it does not spread like grass or mycelium as it is not an actual plant or fungus, nor can grass or mycelium spread onto it because it is infertile.