Surrounding the short main stem of the hermit bud are flexible stems that help support the large inflorescence. These flexible stems are highly evolved and have a strong growth response to gravity, called gravitropism, and to touch, called thigmotropism. As the bud enlarges and gets heavier the stems expand outward like giant legs to support the increasing weight. When an object or person stands close to a stem it will also grow towards the object and coil around it like a tendril. The Na’vi are careful to move quickly when harvesting seeds to avoid being caught in a web of stems.