Vines

Vines (sometimes mistaken as Ivy) are a confirmed new addition into the Adventure Update and will be placeable on walls and ceilings. They will also hang on leaves in Swamps. As of the Beta 1.8 pre-release, they take as long to break as leaves and drop nothing. However, they are collectable by using shears.


 * If blocks are placed near a vine (such as the case of having a house built in a swamp biome, for instance), vines will start growing on the wall.


 * Vines can grow in any direction when placed on a block. When there is no block next to the block where the vine is on it can grow to the side of the block. The vine can even grow up.
 * Like Signs and Ladders, only one of vine may be placed in a single block of air.


 * When vines grow they don't need a block below them to attach themself to. However the most top vine needs an block to be attached to. If that block is destroyed all vines are destroyed.


 * Vines cannot be placed directly on blocks like chests, workbenches and the cobweb block. However, they can be grown around them.


 * Vines are flammable.


 * Vines are most effectively destroyed by water. Vines on a mountain (for example) can be easily flushed away by putting a water source block on the mountain.


 * Vines block mobs' line of sight, so it is possible to sneak up on mobs by hiding behind vines.


 * You cannot place vines directly below blocks but they can grow under blocks.


 * When placed on a wall that is touching the bottom of a block, The vine will also attach to the bottom of the block.


 * Vines have the same colour as foliage has in a specific biome.

Trivia

 * Vines' grey shade in the terrain.png released by Jeb shows that its colour will vary between biomes.
 * At the PAX, Vines hadn't been given a name, and a mouse over would not give a title. This implies that they didn't have an official name at the time.
 * Vines cannot be climbed.
 * The player is able to walk through vines.
 * Vines, when held, and viewed through third-person view or held by another player another player, have a gray texture.

Griefing
In the 1.8 pre-release, the rate at which vines spread made them the newest tool for griefers.

On Sept 13, Notch said that he would change vines would still spread infinitely down, but would not grow other directions if there are more than four other vine blocks nearby