Just to share my experiences with disappearing iris:
In the summer and the fall I have had skunks dig them up searching for grubs and rabbits trying to "sample" the newly planted ones. Both critters leave them laying somewhere on the top of the ground.
In the late fall and winter, if exposed, rabbits, will find the most palatable and use them as a salad for grazing. Some of them will be eaten right into the rhizome and that makes them "goners".
I mostly circle my new iris with rabbit fencing in October and all my iris beds have two tiers of rabbit fencing.
On the bright side some of my no show or moved to another location iris have shown up YEARS later in the original location!
