Etoile Violette leaves missing
I bought an Etoile Violette during last winter; it has been going great guns, but recently I've noticed that the top leaves are disappearing (being eaten I assume):
You can see that the lower leaves are OK, it's just the top leaves that are missing. Any thoughts on what is causing this?
I assume it's a bird of some sort as I think slugs would have done damage to the lower leaves, not just the ones at the very top.