Lianas

Lianas will randomly hang from jungle trees in the jungle biome. When randomtickspeed is on, lianas will slowly grow to the ground and stop in one block height. If you plant a liana on a non-plant block, it will not grow naturally, so you can use lianas in your home. Lianas are also a new climbing method,whit its own new cool animation! When you jump against them you will start climbing.They will be a little bit slower to climb than vines and ladders.

Why we need them in Minecraft?

In minecraft we already have vines and ladders, but these two must be placed on the side of a block. Lianas can hang in the middle of a room and don't need a block behind them to exist, this will give players many new ways for building their houses. Also Lianas could be used in adventure maps and jump and runs.