I think elephant garlic can be classed as perennial. I can't grow garlic/onions due to onion rot but I have a patch of elephant garlic. I harvest every year and it always comes back. All those little ones get left behind and carry on growing.
I have disturbed in now - in favour of my new flower beds, but it's probably been there for 8 years at least.
I have disturbed in now - in favour of my new flower beds, but it's probably been there for 8 years at least.