Create a Specific Biome Blend
Combine
Bland Blend with Biome Items
Now that you have a bland blend, you need to pair it with an item from your target biome. Each biome has associated items—jungle leaves for jungles, sand for deserts, soul sand for the Nether, and so forth.
Place your bland blend and the biome item together in a crafting table. The result is a biome blend specific to that biome.
Hold and Use Your Blend
Move the biome blend to your hotbar and hold it in your hand. Stand in the area you want to transform and right-click on the ground. Green particles will appear, and the biome around you will shift to match your blend.
Understand the Effect Range
The biome change affects a radius around where you click. By default, this extends several blocks in every direction, creating a noticeable transformed area. The exact size can be customized through data packs if you want to adjust the effect radius for your world.