1: [Young]
Before they can grow into a mighty figure worthy of Quint status, Gnarls undergo an awkward pubescence where they must find themselves - quite literally! As parasitic vines that work together to control their arboreal host, a single bloom is simply too weak to achieve total motor control mastery. For this reason, budding Gnarls gather together in modest bushes to practice vine arts and find their partner in parasitism.
2: [Adult]
Once a mature Gnarls perfectly finds its perfectly parasitic counterpart, the two beings use their lengthy vines to swing branch-to-branch, stalactite-to-stalagmite to find a more 'spacious' host to call home. With its motor functions now under the control of its friendly new Gnarls, the tree host can finally uproot itself from its sedentary lifestyle and travel the world! The murmur of the breeze blowing through their tendrils provides a pleasant ambiance for Gnarls' vine-raising globetrotting expeditions.
3: [Prismatic] These Gnarls returned from the Prism Gate forever changed! While the Gnarls' tree host was unaffected by the power of the Prism Gate, the parasitic Plant Monsters themselves were reconstituted and fused at the molecular level, resulting in some light (okay, moderate) scorching of the trunk. Fret not, for even in the face of its Fiery transformation, the tree will grow back stronger than ever - extraordinary!