Minecraft wiki entry for Twisting_Vines, associated text: Twisting vines can be placed on any block except for transparent blocks (e.g. leaves and fences), and automatically begin to grow. Twisting vines can also be used similarly to a water bucket, as it can prevent fall damage. Applying bone meal to any block of twisting vines causes it to grow immediately. It occasionally spawns if bonemeal is used on warped nylium found in warped forest floors.