How To Control Nut Grass In Gardens

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Nut grass, also called nutsedge, is a horrifically resilient weed that plagues many a lawn. It has strong roots and nodules that are often referred to as "nuts" (hence the name). The most thorough way to rid your lawn of nut grass is by removing the plant, root and all, by hand. You can also try chemical herbicides, however, or you can coat the grass in sugar as an organic alternative.

1

Look for patches of grass that appear out of place. Nutgrass generally grows taller and looks lighter than the rest of your grass. Since it is similar to other grass varieties, small patches can be difficult to notice unless you are specifically looking for them.
2

Examine the blades. Kneel on the ground and look at the shape and thickness of the grass blades growing in out of place patches. Nutgrass has thick, stiff blades that shoot up from stems in sets of three. Most normal varieties of grass have two blades that shoot up from a single stem.^[1]
3

Examine the stems. Break a stem of potential nutgrass off and look at the broken end. Nutgrass has a triangular stem with a solid center, while most normal grasses have rounded stems. Many normal grasses are also more hollow inside than they are solid.^[2]
4

Carefully dig down to the root of the nutgrass. If you suspect that you have nutgrass based on the appearance of the upper half of the plant, you can either proceed to remove the grass immediately or you can dig down to the root to confirm your suspicions before taking further action. Use a garden trowel to cautiously dig beside the patch of grass and look for any nut-shaped nodules at the root. You may need to dig as deep as 12 to 18 inches (30 to 46 centimeters).^[3]

1

Slip on a pair of gardening gloves. You will need to dig into the dirt quite a bit using this method, and gardening gloves should reduce the amount of dirt you get on your skin and under your nails.
2

Insert a gardening trowel directly next to the nut grass. Dig down as far as you can go. Nut grass root systems can extend as deep down as 12 to 18 inches (30 to 46 centimeters) below the surface.^[4]
3

Gently pry the nut grass, roots and all, out of the ground. Doing this gently is vital to reduce the number of roots that break off, as well as the number of pieces those roots break into.
4

Dig out any stray roots. If any roots remain, there is still some chance that the nut grass can return.
5

Put the weeds into a garbage bag, along with the soil you dug out simultaneously. Dispose of the weeds in your trash. Do not throw them into a pile or into a compost heap, since you may end up spreading them into another area of your lawn by doing so.

1

Perform this procedure in spring. It proves most effective at the start of the growing season, when nut grass is just barely beginning to germinate and sprout.^[5]
2

Use a hose to water the lawn. You do not need to soak it, but the lawn should be evenly moist down to the soil.
3
Sift sugar over your lawn in straight lines. Walk up and down the lawn in straight lines and at a steady pace. Pour the sugar through a sifter as you walk, continually turning the handle of the sifter the make sure that the sugar falls on the grass in even amounts.
- This is no mere folk remedy. Sugar actually "eats" the nut grass while nourishing microbes that have a positive effect on your lawn.
4

Spray the lawn once more using a hose. Do not saturate the grass, since doing so will wash the sugar away. Spray the lawn with a light mist, providing just enough water to re-moisten the blades of grass and coax the sugar down into the soil and the roots of the lawn.
5

Repeat this procedure at least twice more throughout the spring. The nut grass may not die off completely after the first treatment, but after a couple more, all of it should be dead.

1

Use herbicide before the nut grass develops five true leaves. Leafy nut grass has too many obstacles, preventing herbicides from sliding down to the "nuts" and the root. Herbicides work best early in the season, while nut grass is still young and has minimal leaves.^[6]
2

Select an appropriate herbicide. Products that contain MSMA or products with a chemical called bentazon work best.^[7] Nut grass is a common enough problem, so typically speaking, herbicides that work against the weed will be labeled as "nut grass killers."
3

Allow the grass to grow for a few days prior to application. The herbicide works best when the weed is growing vigorously, and may not be as effective if applied immediately after cutting the weed down. Wait two or more days after your last lawn mowing before applying the chemical to the lawn.^[8]
4

Apply the herbicide during a dry period. Wait several days after your last watering, and do not spray the herbicide if you may get rain four hours after application or if you expect heavy rains to follow in coming days. Water will wash the chemical away, and it may not have the chance to do its job before that happens.
5

Read the instructions on the label of your herbicide bottle to determine how to apply it properly. ^[9] You will usually spray diluted MSMA herbicide over your entire lawn. For instance, the instructions may tell you to mix 1.5 ounces (45 milliliters) of chemical into 5 gallons (20 liters) of water to treat 1000 square feet (92.9 square meters) of lawn.
6

Repeat the treatment several times during the growing season. Warm season grass may only require two applications, but cool season grass may need four to eight applications before the nut grass dies off completely.

Add New Question

Question

How do I get rid of nutgrass and prevent it from coming back?

I was so desperate to get rid of the nutgrass in my ground cover that I made a tool (taped 6 cotton buds together) and applied poison to each individual strand of the grass. I was very careful to avoid the ground cover. It was very difficult to get enough to coat the grass without harming the ground cover. I did this over a few days to the same strands until I saw they were dead. They have never returned.
Question

I have nutgrass in my flower beds; I thought I had dug all of it out, but it continues to pop up. What is best method to kill it without killing lantana?

Nut grass "nut" is 30 feet below and can stay dormant for years. Try using a liquid weed killer to keep it under control. I have yet to kill a lantana even with straight weed killer on it. They are very hardy.
Question

Why do people want to get rid of nutgrass?

Because it's unsightly, chokes other plants, takes the nutrients in the soil for itself, and generally drives most people crazy!
Question

Can I use Roundup on nutgrass?

Yes, but be aware that Roundup kills anything it's sprayed on. Be careful where you apply it.
Question

Can I hydro mulch my lawn over nutsedge?

Yes, but the weed will benefit from the hydromulch fertilizer and watering too. Since nutsedge is a hardy, aggressive weed that spreads rapidly, and since it is already in your soil, it will dominate whatever seed is in the hydromulch and continue to take over. Better to kill all the nutsedge first.
Question

How do I get it out of my vegetable garden? It has spread and as been rototilled three times this spring. I now have vegetables coming up after I thought the rototilling would take care of it.

You'll probably need to till the garden before a good freeze to get some control. Otherwise the only other way I've ever gotten control is a heavy dose of pre-emerge in the early spring. It would have to be labeled to use in the garden, and you couldn't plant seed until late summer.
Question

Will livestock eat nutgrass?

In some cases, yes, they may eat nutgrass.
Question

Can I cut down nutgrass and spray the rest of what's left to get rid of it?

Wait 2-3 days after cutting. It is best to spray when it is growing,

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Determine whether or not the nut grass is growing in a wet area. Oftentimes, nut grass develops because of poor drainage. If you discover that nut grass is growing in a wet area, you may be able to minimize further growth by drying out the grass and looking for ways to improve the drainage properties of the soil. This may not be enough to kill this resilient weed, since it can grow even in drought-like conditions, but it may reduce the amount of nut grass.
Do not attempt to lay mulch over nut grass. This weed is so persistent that it will usually push its way through mulches, cloth, and even plastic.
Never turn the soil in an attempt to remove the nut grass. Turning the soil will only end up spreading the "nuts," and may actually make the problem worse instead of better.

Thanks for submitting a tip for review!

Keep children and animals off the grass for 24 to 72 hours after applying a chemical weed killer. Many of these chemicals are toxic if consumed.
Be aware of the fact that broad-application chemical herbicides, especially those containing MSMA, can discolor your grass after frequent application.

Things You'll Need

Gardening gloves
Garden trowel
Garden hose
Sifter
Sugar
Herbicide

About This Article

Article SummaryX

To get rid of nutgrass, slip on a pair of gardening gloves and use a small shovel to carefully dig down to the roots of the plant. The roots can be up to 12 to 18 inches deep, so keep digging until you find the ends of the root system. Once you reach the bottom of the roots, carefully dig out the plant to avoid leaving any roots behind. Then, dispose of the plant right away so it won't have a chance to spread. To help prevent nutgrass, each spring you should water your lawn and then sift sugar onto the grass. To learn how to kill nutgrass with herbicides, read on!

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