Wildvine has five vine-like legs, four claws on his hands and venus flytrap-shaped flaps covering its head. It has pods on it's back that can either be explosive or smoke bombs. He has one blue eye in the middle of his face.
In Ultimate Alien, Wildvine is now a brownish-green in color, the bulbs on his shoulders are now green, and his flytrap teeth are now black, he now has black lines running down his arms.
In Omniverse, Wildvine is the same but taller and more muscular, he now has four legs instead of five. He wears the Omnitrix symbol on a green and white belt.
11 year old Ben as Wildvine Omniverse looks the same except his eyes are green and now a hexagon shape and his flytrap teeth are bigger.
Wildvine can extend all parts of his body, can grow and retract most of his body and can merge with plant life, like a tree and control its branches. He can also grow defenses on his body like thorns extremely quickly.
Wildvine is a plant based species as such this form requires water and sunlight to survive, while Swampfire does not have this issue. Ben has not really dealt with this issues as the Omnitrix always times out after a certain time period.