Rid lawn and garden of Wild Chrysanthemum aka Mugwort

 We've got a two year old yard and garden planted out with smallish
plants.  This year, the Wild Chrysanthemum (aka Mugwort) is taking over.

http://www.rce.rutgers.edu/weeds/weed.asp?pname=mugwort

It's mostly in the mulched beds with plants, rather than in the grass
which seems like it's dense enough to prevent the mugwort from getting
established.

I understand it's rather difficult to get rid of so I'm looking for
suggestions from folks that have fought -- and won -- this battle.

Thanks.