I'm trying to figure out a movie's name. In the movie there was a woman running away from some plant creature, and she was knocked out. I remember it tried to rape her and ripped her shorts as its vines grew bigger. I think she managed to cut off the vine and run away.
This sounds like the famous "tree rape scene" from the 1981 film The Evil Dead. It was the first of the trilogy of humorous horror films made directed by Sam Raimi and starring Bruce Campbell as Ash.
"There's Nothing Out There!" (1991)
There is a scene just like that in this movie. The creature is green and looks plant-like, a girl has her shorts ripped off and then runs into a tree and knocks herself out. The full movie is available on YouTube and is posted below. That scene starts at the 30 minute mark.