Posted: 15/05/2016 at 12:28
It is Euphorbia Lathyris, it is said to deter moles. It is a annual and if left will send its seeds all around your garden. I usually pull up the ones I don't want and just keep a few.
It doesn't have nice flowers like other Euphorbia, it can be bought in your garden with the wind,birds or in other plants.