Q & A: Help! How do I get rid of pesky onion weed in my garden?

Q: Pesky onion week is popping up everywhere in my garden. I've tried digging it out, but it still comes back. How can I get rid of it?

from
http://www.stuff.co.nz/life-style/home-property/81748181/Q-A-Help-How-do-I-get-rid-of-pesky-onion-weed-in-my-garden