Just a heads up guys. Mod Ninja came into my world and asked questions, if we had any problems, ect. While he was there, someone asked him what the drop rate of the Whip Vine was. Mod Ninja said that he couldn't say the drop rate. But then someone said "Probably 1/512, like the whip" To which Mod Ninja replied "That would be a good prediction though. ;)" So the drop rate is probably a little below or higher than that.