HELP! A small white flowering plant is taking over my yard! It is called The Star of Bethlehem. Despite what all the botanical sites say, it is very invasive! It grows from small bulbs that proliferate deep into the soil. It first sprouts as green stems that look like wild onions, followed by small, white flowers. I have tried digging them out - impossible! I have round-upped them! I have cut them off as they bloomed! Every year they are back with a vengeance! Any suggestions?