This was in the vegetable garden established down near the well. If you zoom in on the map you can see exactly where. And the plant - I assumed they were flowering garlic, certainly an overgrown Allium of some sort.
They definitely weren't garlic chives. Interestingly the garlic chives I have here in the garden have pinky-purple almost tubular flowers. And while the clump slowly spreads, I've never found them to be invasive. The plants on Montague would have to have been either garlic or onion.