Minecraft wiki entry for Glow_berry_farming, associated text: Glow berry farming is the process of producing more glow berries by bonemealing an existing one, or by leaving it and harvesting it when it increases in height. It allows you to obtain more glow berries without having to find them. Glow berries are extremely rare outside bonemealing or growing them, with the only other way having to find them in mineshaft chests, so having a way to farm them is handy, however the primary use of glow berries is for decoration (they make a good aesthetic light for most builds, especially rustic style) since it can only be used elsewhere to breed foxes and a very low saturation food, so consider that before deciding to produce more of them.