Venus Human Trap

The Venus Human Trap is a horror/monster movie idea by me. Its rating is PG-13 for violence, language and minor blood(but no gore)

Plot
A group of scientists manage to create a plant growth formula to help people's gardens grow faster. A person buys it, but he forgets to read the side effects of putting too much. It makes it giant and evil. He puts too much by accident and the his venus flytrap grows to giant monster size and rips itself out of the ground, and uses some of its vines for legs and heads towards Chicago. It reaches Chicago and goes on a rampage destroying every building in sight and killing over 10,000 people. The military weapons are usless against it. How will they stop the Venus Human Trap?

Note
The movie's title was inspired by the weapon in Destroy all humans: Path of the furon.