Minecraft wiki entry for Weeping_Vines, associated text: Weeping vines are broken instantly using any tool. They have a 33% chance to drop a single weeping vine when broken, increased to 55% with Fortune I, 77% with Fortune II, and 100% with Fortune III. They always drop a single weeping vine when broken with shears or a tool enchanted with Silk Touch. Any segments left unsupported from above break with a 33% drop chance, regardless of tool used. Accordingly, weeping vines are best harvested from the bottom.