Grass (commonly named Tall Grass or Long Grass) spawns on Grass blocks in certain biomes. Tall grass is not a solid block, but rather an aesthetic plant that does not obstruct movement, similar to Sugar Cane, Dead Bush and Wheat. It occurs naturally and in larger quantities than the previous plants. Bone Meal can be used on a grass block to grow Tall Grass and occasionally Flowers on it and in its vicinity.
A triangular-looking fern (also known as "living shrub")