Grasses

Grass enables many plants plants to grow on it. Grass covers most of the above ground landscape. There are four types of grass:

Normal grass spreads over Dirt Blocks. Above ground grass blocks send up Mushroom, flowers and weeds, all of which can be cut with any tool or weapon. If a grass block has room below it, vines will grow downward from it.

Grass is necessary in order to plant trees. Grass does not normally spread below level elevations, but can be propagated using the Staff of Regrowth. This grass will not grow flowers and tall grass, and trees planted on it will not grow.

Grass occurs naturally above ground, but it may also be planted by using Grass Seeds bought from the Dryad.

Other grass types
Other grass types include corrupted grass, which also grows on dirt, as well as mushroom grass and jungle grass, both of which grow on Mud Blocks.

Corrupted grass will grow Vile Mushrooms, corrupted flowers and weeds in the same conditions as normal grass. In addition, corrupted thorns will grow from corrupted grass in any condition. Vines do not grow from corrupted grass. This type of grass occurs naturally in corrupted areas and may also be planted from Corrupt Seeds dropped by the Eye of Cthulhu. A large enough amount of corrupted grass will turn the area into the Corruption biome.

Mushroom grass will grow exclusively Glowing Mushrooms, and only if underground. Patches of mud seeded with mushroom grass can be found in some caverns underground, generally with several tall Mushroom Trees. Mushroom Grass Seeds are an uncommon drop from glowing mushrooms and mushroom trees. If planted above, the grass will not spread and not grow anything. Mushroom grass glows faintly and can be deliberately used as a light source underground.

Jungle grass will grow vines, jungle thorns, and a variety of jungle flowers from which Jungle Roses and Nature's Gift can be harvested. Jungle grass normally occurs only in the Jungle and Underground Jungle area but can also be planted from Jungle Grass Seeds which are a rare drop from jungle grass weeds and glowing flowers.