Glowstems appear in Pikmin 2. They appear to Hocotatian explorers to be relatives of the Common Glowcap but in actuality, these tiny lights are what are known as LEDs, or Light-emitting diodes They are never seen above ground and can only be found in certain cave sublevels with a metallic layout. Despite the lack of insulation covering the live wires, glowstems pose no electrical threat, nor any other kind, to Pikmin or captains, and have been added to levels merely for aesthetic affect. Rarely, they appear in a green version. Coming into contact with these plants can, apparently in all places they're found, cause Bomb-rocks to drop from the ceiling. This is relatively easy to cause on the 5th sublevel of Subterranean Complex. If attempts are unsuccessful, run around the sublevel running into each Glowstem after it has already been cleared of bomb-rocks and Volatile Dweevils. At least one bomb-rock should be triggered by the Glowstems. This can happen with either the red or the green variants of Glowstem, as both appear in the sublevel.