Nutsedge Weed Prevention – How to Stop Nutgrass from Growing?

Nutsedge or nutgrass is a destructive weed. While you it’s tempting to think you have gotten rid of it, that’s not always the case because its underground network of rhizomes or tubers, when left to mature, can remain dormant for up to a decade. 

Owing to its invincibility and resistance to pre-emergents, nutsedge is a hard nut to crack. Finding the grass species of the genus cyperus rotundas is also a tall order because it masquerades as grass. However, anything resembling grass and grows faster and taller than normal raises suspicion. 

Also to watch out for is red-purple seedheads, lime-green color or triangular cross-sections of stems and blades. But amid the grim picture there’s good news. Nutsedge isn’t that invincible, after all. You don’t need a toxic glyphosate, or N-(phosphonomethyl) glycine, to eliminate it.

You can create homemade solution. Yes, that’s right. As simple a solution as sugar can be surprisingly effective against the stubborn weed. Sugar fosters the growth of beneficial microbes. What’s more, Sempra is a selective proprietary weedkiller that you can rely on!

How Do You Get Rid of Nutgrass?

Natural and artificial ways to kill nutsedge exist. Vinegar, horticultural molasses, and hydrogen peroxide provide a natural way to control nutgrass. Other methods range from pulling the nutty weed to luring the underground tubers to starvation.

Does Vinegar Kill Nutgrass?

Acetic acid is the active compound responsible for vinegar’s burning effect. A concentration of between 10% and 20% of the active compound more than suffices to be effective. Owing to the burning effect, you should be careful when you spray the vinegar solution because it could harm the surrounding plants. 

You can fashion a funnel out of a bottle’s upper torso or buy a funnel that can guide spraying. Vinegar’s effectiveness reduces during a dull and windy day. And so, avoid applying the post-emergent during such days. Stop spraying when the weed dies.

When Should I Spray for Nutsedge?

Timing is important. The best time to spray is when the nutsedge is at its peak growth season, which, usually, is a transition between cool and warm seasons. Like, a transition between late spring and early summer. The plant is young and fast-growing, and it hasn’t developed the seedheads and the underground network of tubers, yet. 

What Chemical Will Kill Nutgrass?

Pre-emergents don’t work against this grass-type. However, sulfentrazone- or halosulfuron-containing post-emergents are effective antidotes. While it’s important to mow your lawn regularly to keep it healthy, give it at least two days before you mow again and apply the post-emergent. Proprietary glyphosate herbicides like 

Roundup or Zero are effective post-emergents against an entrenched nutty weed. Typically, a mature weed at least a month old. Their major downside is that they are toxic — they also poison the plants you want to keep! Toxicity spreads because of the characteristic translocation of the herbicide within the affected plant and its underground network of tubers or rhizomes.  

Is It OK to Pull Nutsedge?

Of course, it’s the cheapest, but labor-intensive method. However, the caveat is you need to pull the stubborn grass-type from the root. Do this gently. Else, your efforts end up nought. Be sure to wet the ground before you embark on pulling the weed. 

This would ensure you pull out all the rizhomes, tubers, or any other leftovers capable of spawning new weeds that have buried themselves deep in the soil. Depths can go as far as 18-inches. So, arm yourself with a garden trowel. You need to slide this tool into the soil beside the weed.

How Long Does Sempra Take to Kill Nutgrass?

Halosulfuron methyl, commercially referred to as Sempra, is a selective herb killer. And the good thing about the post-emergent weedkiller is that it zeroes in on nutgrass! The active compound blocks the pathway of the enzyme acetolactate synthase, leading to its deactivation. 

The enzyme is responsible for growth of the nutty weed. With stunted growth, the weed dies after two or three weeks. Sempra will have broken down by half its original concentration during the 34th day. Unlike glyphosate, halosulfuron methyl doesn’t translocate, and so you may need to reapply it several times. 

How do I Get Rid of Nutgrass in my Couch?

The solution can be a simple homemade as sugar, which promotes the growth of anti-weed microbes. However, selective post-emergents such as Sempra and Amgrow Sedgehammer offer viable alternatives. Glyphosate is viable solution if you want to silence the stubborn grass species once-and-for-all owing to its translocation property. However, translocation is a double-edged sword. It’s non-selective because it kills any plant it touches.

How do I Get Rid of Nutsedge in my Garden?

Mowing your garden regularly can keep nutsedge at bay. Moreover, maintaining proper drainage can hamper the spread of the destructive grass-type. Improving air circulation in soil also fosters a hostile ground for nutgrass. And more importantly, trick the nutty weed tubers with vinegar or a flame weeder to respawn, so they can exhaust their energy. Do this repeatedly to foster starvation of the underground rhizomes. Read more…


The grass-like nutsedge isn’t as invincible as you might think. While difficult to control, the secret to successfully vanquishing it is to lure it to starvation. You can also apply weedkillers when it’s young and growing fats and it hasn’t developed underground tubers yet.

This is especially so during the transition between cool and warm temperatures. If you want a cheap homemade solution, you can use vinegar or sugar. But if you want to get rid of the stubborn plant once and for all, you can use a translocating herbicide such as glyphosate. But if you want to zero in on the nutgrass, use Sempra.

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