Thanks for your feedback Glengar.
Presently I have no idea why that's happening on Console, as the Oat's work fine on PC. The only thing I can guess at is maybe parts of the foliage coding are hardcode on Console and because my Oat's are not just an edited texture, but use different 3D meshes maybe that is the cause of the conflict. But then custom crops work on Console so that really shouldn't be an issue.
The only other thing I can think of is when you copied the .i3d and shapes file, textures etc across to the console version of the map, something didn't copy across correctly, that can happen in Windows when copying and replacing files.