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Pesky weeds join flowers, grass as easy-to-grow vegetation


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Master Gardener Tom Terry
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Master Gardener
Posted Jul 01, 2008 @ 06:34 PM

SHAWNEE, Okla. —

This has been a great season for growing flowers, grass, shrubs, trees and weeds.  It seems to me that weeds have out grown every other type of vegetation unless it is miniature pecan trees, the product of the pecans that squirrels buried last fall.
There are actions that can be taken to combat some of the more troublesome weeds such as Dallis grass, crab grass and nut grass growing in the lawn.  Dallis grass is the broad leaf weed that grows in a round clump and has stems with seed heads. It grows extremely fast.  I have successfully used MSMA herbicide on these weeds in Bermuda grass.  It cannot be used on St. Augustine or fescue lawns, however because it attacks broadleaf plants.
MSMA is applied as a spray and is available at stores that sell pesticides.  It is mixed with water.  Label directions should be followed.  In some instances you may see some yellowing of the Bermuda grass but it will quickly recover.   Application should be made on a day that isn’t windy, the temperature is 85 degrees or more, and no rain is predicted in the next 24 hours.  Children and pets should stay off the treated area until the spray has a chance to dry.  Heavily infested lawns may need more than one application.
I have used MSMA with some success on nut grass growing in flowerbeds.  Shrubs and flowers should be protected from the spray using cardboard or some other protection between the spray and the desirable plant.  Another method is to place the solution into a small container and use a paintbrush to apply the solution to the nut grass in a flower bed.  This is tedious, but is better than continually pulling nut grass up.  When nut grass is pulled from the ground, it leaves nodules where the roots were and these develop into multiple plants in a very short time.
Bermuda grass that is growing in flower beds is another problem.  Several companies make a selective spray that can be used to kill Bermuda grass in flowerbeds without damaging most flowers and shrubs.  It is available in a premixed solution and in concentrated form.  The concentrate is fairly expensive, but is more economical if you need a large amount and can mix it in a sprayer.  Read the label carefully for plants that it will damage. Unless something new is on the market, it can’t be sprayed on juniper groundcovers.  Digging the grass out from under the spreaders it about the only solution.  My experience is that it takes several attempts to get all the grass roots removed.

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