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Grass is a common material found on many planets. It is a very important material, as it is used to make rubber, which is required in many crafting recipes, including hydroponics, which is the only source of grass on planets with no grass. Can also be used to make food and cloth.
In-game description
"An organic substance found in terra and forest planets. Often green, but can be other colors. Useful for planting seeds for agriculture."