Grass

Tall Grass is an upcoming feature in 1.6. It will spawn on Grass blocks in certain biomes. Seeds will only spawn from harvesting these blocks. Little else is known about it however. Based on the picture provided, tall grass will not be a solid block, but more like an aesthetic weed that would get in the way but would not block movements, like Sugar Cane and Wheat. The inspiration comes from Terraria (An game that's like Minecraft but 2d)

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

Trivia

 * It is possible that the tall grass will not block movement but will slow the player down like if they are moving on Soul Sand or Webs
 * It might not grow like in the wild grass mod.