If you know how to make green dye in Minecraft, you can add color to beds, banners, wool, and more. You can also make stained glass, green concrete powder, and more dyes.

To make Green Dye, melt a Cactus in a Furnace. Follow these steps:

Mine a Cactus. Cacti grow in desert and wasteland biomes.

Make a Furnace. On a Crafting Table, place 8 Cobblestones or Blackstones in the outer boxes, leaving the middle box empty.