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should i pull or cut the grass?

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Hi, i was wondering which is the best way of getting rid of johnson grass, should i pull each plant from the root? or is it sufficient if i use the lamp and cut them from the upper the roots.

Pulling out by hand should take too much time. which is better for johnson grass?

Other question, should i leave the dead plants over the soil as mulch or biomass?

thanks in advance
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Location: Moved from south central WI to Portland, OR
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You might have success covering the patch with cardboard or several layers of newsprint, then covering that with a thick layer of mulch. Pulling out by hand is too much work. Let the worms eat the Johnson grass for you!

I don't know what you mean by "use the lamp."
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Location: New England
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Depends on the scope. Sheet mulching works great if they are in small colonies. Larger, might be hard to get enough material to sheet with. Covering for 2 growing seasons if you are reusing the sheeting.

Pulling smaller plants that haven't spread, or seedlings is probably pretty efficient. Learning to identify the grass from the ligule might be a good idea.

Repeated and close mowing kills Johnson grass seedlings, prevents seed production, and reduces rhizome growth and regrowth of shoots.
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