This changes the dirt in flower pots depending on what plant is put inside it. Below is a chart of the dirts to the plants:

Dirt:
-Empty

Sand:
-Dead Bush

Podzol:
-Fern
-Bamboo
-Spruce Sapling

Grass:
-All Flowers except Wither Rose
-All Saplings except Spruce Sapling


Mycelium:
-Red Mushroom
-Brown Mushroom

Warped Nylium:
-Warped Fungus
-Warped Roots

Crimson Nylium:
-Crimson Fungus
-Crimson Roots

Soul Sand:
-Wither Rose