Zuzu ...
I did ask Kim about your comment that the gophers seemed to leave roses grafted to multiflora alone as compared to those grafted to Dr. H. He said it was probably due to the fact the multiflora has much more fibrous roots and told me that his answer was just speculation.
Now, you've added a whole new dimension to the question about gophers and Dr. H. As you know, I always want to know the "why" of things, so I'll ask him the next time I talk with him.
Smiles,
Lyn