Minecraft wiki entry for Removed_blocks, associated text: In contrast to almost all other invalid metadata variants of blocks, the shrub was not removed in 14w26a with the switch to block states, and the shrub remained a valid block. (The "green shrub", which refers to blocks with the shrub/grass ID with metadata values exceeding the expected values, were in fact removed, and were not intentionally implemented in the first place, which is why they are not listed on this page.)