Minecraft wiki entry for Snow, associated text: If the snow is on a grass block (or mycelium or podzol in Java Edition[2]) the ground cover turns white on the top and around the sides. Snow does not damage tilled and hydrated field areas – it cannot be placed on farmland. A gravity-affected block like sand or gravel does not fall if snow covers the block below it, but the gravity-affected block does replace a snow layer when falling onto it. The texture of the grass block changes to snowy when a single layer of snow is placed on top.[3][4] Thicker layers of snow causes the grass block to revert to plain dirt when the block receives a random tick, similar to regular grass when covered by an opaque block. A plain dirt block with a single layer of snow on top gains a snowy texture if grass spreads to it.