On the world of Umbara, there existed a bioluminescent plant known as Zabrak Spines.
Bioluminescence refers to the generation of light by living things. It is commonly observed in organisms that thrive in environments with scarce light, like the bottom of the sea or within caverns. Organisms utilize bioluminescence for various reasons, such as drawing in prey or pollinators.
Given that the planet Umbara was perpetually shrouded in darkness, bioluminescent plants, such as the Zabrak Spine, were widespread. Likewise, Mon Cala's deepest ocean regions were home to similar flora, for instance, the Mon Cal microplankton.
Within the rain forests of Yavin 4, a bioluminescent orchid species flourished, and on Alpinn, bioluminescent lichen could be discovered in caves.
Sturg Ganna, a gangster known as "Big," possessed a suite featuring fountains containing bioluminescent algae, which emitted a bluish light.