It looks like pineapple weed/aka pineapple mayweed/Camomilla suaveolens. If it is then yes, weed it out, I seem to recall that something finds it toxic, sheep perhaps. The flower is a petal-less bobble, yellow. Your specimen looks a little more lush than usual perhaps because it's growing in a veg bed, whereas it normally grows where people and animals have been trampling.