Grass

Tall Grass was implemented in the game in 1.6. . It spawns on Grass blocks in certain biomes. Seeds are no longer able to be produced from grass blocks and only spawns from harvesting these blocks. Little else is known about it however. Tall grass isn't a solid block, but rather an aesthetic weed that does not block movements, like Sugar Cane, Dead Shrubs and Wheat; just occuring naturally in large quantities.

The color of tall grass is biome dependant, and the same color as grass.

Tall Grass does not drop when destroyed, therefor it's impossible to replant it