I have been following this conversation , and by the numbers so have many others .
Very interesting
It makes sense that green garlic would be immature garlic kinda like green onions are immature onions. (or sometimes bunching onions)
I have grown the garlic chives (allium tuberosum) for years . they flower late in the summer (white bloom) and should be deadheaded if you do not want them to take over (I agree with the invasive label) . They supposedly are good to zone 7 but mine come back regularly here in zone 5.
I have some garlic out in the herb bed that was planted 3+ years ago and never harvested , I need to dig some it is small so I never expected to get bulbs (heads ) of any size so just never dug it up . Maybe I have green garlic?
Watching the experiment.
Cinda