How to edit a FBX file?

I don’t know if this is possible at all but I bought an asset with plants (fbx files) and I need to make these plants looking dead. Is there any way how I can edit these fbx files so that the plants let their leafs laying on the ground when the user forgot to water the plant?

One option would be to import the .fbx into a content creation program like Maya, Max, or Blender, etc. You could modify the mesh or other attributes of the asset. Along with the you could modify the texture(s) used by the asset using Photoshop, Gimp, etc.

I tried blender, I could import it but I didn’t find our how to move the leafs of the plant…