Do you know some sites that offer free 3d plants like this?

I’ve stumbled upon this site by accident: http://www.loopix-project.com

You can download free plants and trees for your project.

ngPlant - Open Source plant modeling suite

Good find. I also learned that blender has a saplings plugin hidden and also an ivy generator. It’s funny I’ve been searching the web and then I realized what I need is already there hidden somewhere.