Looks like an India mustard Brassica juncea

Agree. Clearly one of the many leafy green family and the stiff central spines would put it in the mustard or collard family. Would need a much closer pic of the leaf edge ruffling to narrow it down more. But either way it is a vegetable not a weed.

Dave

Taste it. Mustard is good cooked or chopped up small in salads. If you like it, keep it.

looks exactly like my mustard greens good chopped and put in stir fries, the spininess reduces in cooking

Thinking it may be a wild mustard - check this out...

https://foragersyear.wordpress.com/2013/01/15/feral-mustard-greens-brassica-juncea-chuck-it-in-the-kimchi/