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I have several large patches of Pennsylvania smartweed and nutsedge. They are taking over my yard.  I reseeded a large area, but would like to rejuvenate the remaining grass.  How can I win against these two stubborn weeds?
 
paul wheaton
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Location: missoula, montana (zone 4)
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I have no experience with either of these and I know that some folks will hold off on responding to see what I say.  So ....  can anybody else help here?

 
Paul Jenny
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Location: Mishawaka , Indiana
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I am not sure exactly what they are but I googled them and one ag site said to use a pre emergent. The only one that I can think of is corn gluten. I have never used it ,(yet ) but you could give it a try. Let us know how it works. The other thing is to use Paul Wheaton's advice on weeds.Mow high, water infrequent, and fertilize ( no chemicals please  ) Good luck !
 
                    
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Thanks for your advice.
    I was feeling rather isolated for resisting the commercial approach to weed control.  This is really an informative site.
 
paul wheaton
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Location: missoula, montana (zone 4)
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If they are annuals, you can beat them pretty easily by mowing high and watering infrequently.  The frost will kill them this year.
 
Paul Jenny
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Location: Mishawaka , Indiana
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Bad news. Nutsedge is a perennial. I am not sure what smartweed is.
http://msucares.com/lawn/lawn/weeds.html
Where I do not like this sites idea on weed control, I did find it very informative.
 
Paul Jenny
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Location: Mishawaka , Indiana
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Nutsedge is a perennial but smartweed is an annual. Here is a better site for weed identification.
http://web.aces.uiuc.edu/weedid/
 
Paul Jenny
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Location: Mishawaka , Indiana
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http://www.turf.uiuc.edu/weed_web/index.htm
This is another good site.
 
                            
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Location: Whidbey Island, Washington
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You can eat the smart weed leaves in salad.
They are a member of the buckwheat family so will do a
similar function as buckwheat in your garden.
peace, Julie
 
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