mint control in beds

I've got a serious outbreak of mint in my new iris beds.  I plowed an area  
for iris in what was an old garden spot.  At one corner was a small 
amount of some kind of mint. I plowed it under along with everything 
else in the field.  Later, I plowed the area into terraces.  I planted 
bearded iris along the top ridge of the terrace and LA's and Sibs in the 
lower areas in between.  I removed all the mint I could during planting.  
It looked really good for a while.  Now the mint has came up in a huge 
area and is taller than the iris I planted.  Does anyone know of a good 
control for this.  There is way too much to be removed by hand, and if 
it's this vigorous, I know it'll come back.  I've heard others mentioning 
round-up around iris.  I'm weary as these iris were just planted this 
summer.  Has anyone used Round-up around beardless iris?  Any help 
appreciated.  Thanks in advance.  Will Warner

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