Weed Prevention in Dwarf Mondo Grass

pabloverde(Z7 Atanta GA)November 20, 2007

I planted some dwarf mondo grass that is doing a pretty good job of spreading. Last spring and summer though I got lots of broad leaf and grassy type weeds in it. In the areas that the mondo grass has become very dense its virtually impossible to manually pull them out.

Does anybody know of a way to kill this stuff without killing the mondo grass? I'm thinking of using a pre-emergent, but I don't want to do anything that will keep the mondo from spreading.

Any recommendations or experience greatly appreciated!


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Anything you put down to kill those "weeds" will also kill off your Dwarf Mondo Grass. The only way to control them is mechanical removal of the "weeds" which can mean digging up some clumps of the Mondo grass and snaking out the roots of the "weeds".

    Bookmark   January 3, 2008 at 7:30AM
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Be advised that over time even mondo grass will become invasive with roots which grow and spread 18 inches deep beneath the soil.

Only root barriers that are wider than 18 inches wide on the ground surface and/or 18 inches deep will prevent the mondo grass from, over time, also becoming an invasive problem.

    Bookmark   January 4, 2008 at 10:55AM
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pabloverde(Z7 Atanta GA)

Thanks for the info.

"Mechanical" means works fine on the areas where the mondo grass is spreading, but it really doesn't work on the areas that are firmly entrenched. Its growing very tightly between large stone pavers. In theory healthy tight knit mondo grass should preclude weeds, right? I wish.

Katrina: I've never known the dwarf variety to be very aggressive. Maybe somewhere else, but not here in the south.

    Bookmark   January 4, 2008 at 3:33PM
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Since I have seen quack grass and Johnston grass roots growing through some very dense root systems of many plants a dense root system is not a protection against any invasive plant species. Someone gave daughter a clump of Daylilies once and the following year there was quack grass growing in the planting bed I had cleaned if all out of they year before. I found, upon digging up that clump of the Daylilies quack grass roots weaving all through the plants roots and only after much rinsing of clay off was I able to clear that root ball of all the invasive roots. I have had the same thing, often enough, that I always make sure any plants I give to others are free of any invasive roots.

    Bookmark   January 5, 2008 at 7:06AM
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You can mix 1oz. Of Roundup with 1 gallon of water in a sprayer. It will kill the weeds and NOT the mondo.

    Bookmark   July 6, 2011 at 6:15PM
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