One of the Flora colossus, Groot, became involved with the criminal Rocket, becoming a friend to him as well as Rocket's partner in crime. Groot fought in the Battle of Xandar and became a member of the Guardians of the Galaxy.
Flora colossus are humanoid in form with a thick, robust body structure that makes them almost invulnerable to physical harm.
They have a highly-accelerated healing factor, able to regrow limbs and even their entire bodies from nothing more than a twig.
They have complete control over their bodies, able to extend their limbs as vines to reach high places or as whip-like weapons, grow twigs on any part of their body as a threat display or shield, change their body shape, grow leaves or flowers, and release bioluminescent airborne seeds.