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weed control

I became interested in irises when I bought my house. A sunny 
hillside of small, not too spectacular but fragrant bearded irises, probably 
planted in the 30's was on the property. I tried to control the grasses by 
lifting and replanting everything about 2 years ago. At this time I 
treated the area with Roundup. I wish now that I had also used a 
preemergent to treat the soil. In any case I am now right back where I 
started from; tall grasses growing in between the irises. Someone 
suggested to me that I use a selection of herbicides called Over the Top, 
or Poast, or Advantage. They maintained that these would kill the grasses 
but not the irises. I've never heard of any of them, and never seen them 
for sale.  Has anyone used any of these herbicides, or can you offer any 
suggestions for controlling tall grass in between the irises?  Thank you! 
Judy Sylvester

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