My grand experiment.
I have a small area about 6' long by 1-1/2 ' wide that I let garlic, shallots, and onions just grow without picking them. I do this just out of curiosity to see what they will do when they go feral.
So, I purchased a clump of seven organic green onions (shallots) from the grocery store. They had about 1/4" root left on the bottom. I cut off the white parts (about 3") and planted them in my feral bin. The green tops will go to the dinner table.
They will probably die, but it will be interesting!