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This grass is slowly taking over my yard, and its highly irritating as it grows at 3-5 times the speed of the rest of the lawn. I'd dearly love to get rid of it, but broad leaf weed killer is not effective and pulling several hundred if not thousands of them is less than ideal. What is it, and can I kill it without killing the surrounding lawn? It has broad leaves that grow off a circular red stem with a red base. It also has a very thick root that I believe hosts several shoots. Most blades I pull pop off with a dozen or so short thin roots, but after I pulled a couple out that had much thicker woody-er roots I realized I wasn't going to do much good by pulling alone. What is this crap, and how can I get red of it?

An example of the plant...

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And an example of the root

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    Things that grow much faster than the surrounding grass are more heavily impacted by repeated mowing than the surrounding grass is, for one thing. What is your mowing/cut height set to? – Ecnerwal Jun 17 '16 at 17:44
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Pretty sure this is good ole crabgrass. Ecnerwal asked how high you were mowing your lawn. Keeping your lawn (cool season grasses) mowed NO LOWER THAN 3" will inhibit germination of any seeds below the 'canopy' of the grasses and is the best preventative measure.

Another method that should be used in conjunction with mowing height is using a bit of glyphosate.With protective gloves, wet the fingers (no drips) with glyphosate/roundup and paint the leaves of this grass. Takes 3 weeks to kill including the roots.

Mowing no shorter than 3" prevents weed seeds from germinating. Also, slows water evaporation. The grass slows growth at 3" so less matter is removed from your lawn each mowing, weekly. Healthy lawns can out compete this weed.

Water deeply, allow to dry before the next deep watering (look this up on our site) and fertilize at least 3 X per growing season with appropriate NPK levels for the season. Use organic, slow release fertilizer...I am not kidding, this makes a huge difference. Fast acting scotts, ortho is worthless in promoting a healthy lawn. Check out Dr. Earth's Lawn Fertilizer. Worth the extra bucks!!

Aerate by pulling plugs, leave to disintegrate on your lawn, minimum once per year.

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This is Nutsedge. There is yellow and purple Nutsedge. Has a large tuberous root system that can go 8 to 14 inches deep. Very difficult to get rid of. Digging up roots seems best bet. Mow on high setting. I have it. Took a while to identify but finally found it!

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