We cook a lot from scratch, and often in bulk for freezing.. I see it as this has grown who am I to stop it, prefer to encourage it suits me..
Besides that I want to do it to see the out come, might not grow to good for all I know.. as far as vampires coming around for tea, hope not
I take it youve never grown it before and when you returned home it was there so to speak?
As far as I understand it planted around autumn times and is grown by planting clove/s rather from seed if I remember from my grandads days. So its not appeared by a bird dropping a seed, have you or your neighbours thrown out old garlic cloves that have grown. if not its wild garlic!
https://www.rhs.org.uk/weeds/wild-garlic-and-crow-garlic