Terraformer is a plant-based "Simuloid" duplicate of the criminal Plantman who gained sentience and struck out on his own.  Terraformer initially resembled his creator's human form (albeit in a different costume), but after sustaining severe damage in battle, transformed into a more plant-like humanoid form.  He can mentally control plants, not only altering their rate and size of growth, but causing them to move on their own.  A facet of this is the ability to communicate with plants and Terraformer has claimed a need to "commune" with plants in this manner on a regular basis to maintain his physical well-being.