06/09/2026
Yes, we are talking about nutgrass again. 😂
Or nutsedge.
Or that bright green, fast-growing, “I just mowed two days ago and here it is waving at me again” w**d that makes Houston homeowners want to sell the house and move to Colorado.
We have covered this before, but y’all keep asking about it because it keeps showing up — in St. Augustine, Bermuda, flower beds, vegetable gardens, new sod, old sod, low spots, wet spots, and especially anywhere the soil has been disturbed.
So let’s hit it again.
First: nutsedge is NOT grass.
That is the part most people miss.
It looks like grass. It grows in the grass. Everyone calls it nutgrass. But technically, it is a sedge, and sedges do not respond to regular w**d killers the way broadleaf w**ds do.
That means:
❌ Weed-and-feed will not fix it.
❌ Regular broadleaf w**d killer will not fix it.
❌ Pulling it by hand usually makes it worse.
❌ Mowing it shorter will not fix it.
❌ Yelling at it from the patio also has a low success rate, although we understand the impulse.
Here’s how to tell if you have nutsedge:
Look for the lighter, brighter yellow-green w**d sticking up above the lawn faster than everything else.
It usually grows faster than your St. Augustine or Bermuda, so a few days after mowing, it looks like it missed the memo.
If you roll the stem between your fingers, it will feel triangular — not round like regular grass.
A common saying is:
“Sedges have edges.”
That little triangle stem is one of the best clues.
Another clue is the way the leaves come out from the base. Nutsedge usually sends up three leaves from one shoot, while regular grass is different.
If it gets tall enough to make a seed head, yellow nutsedge usually has a little umbrella-looking seed head. Kyllinga, which is a close cousin and also common around Houston, usually has a round little ball or pea-looking seed head.
And yes, the difference matters.
Because if you are treating the wrong w**d with the wrong product, you are mostly just walking around the yard with an expensive bottle of hope.
Now here is the part nobody wants to hear:
Stop pulling it.
We know. It feels good.
You see it, you grab it, you yank it, and for five beautiful minutes, you feel like a responsible adult.
But nutsedge has underground nutlets/tubers. When you pull the top, you usually leave those underground pieces behind. Worse, you can break them apart and encourage more of them to sprout.
That is why people say, “I pulled all of it and now I have more.”
Yes. Unfortunately, that can happen.
You are not fighting the leaf you see.
You are fighting the underground bank.
So what actually works?
For Houston lawns, you generally need a sedge-specific herbicide.
Two homeowner options we talk about often are:
✅ SedgeHammer / halosulfuron
✅ Dismiss / sulfentrazone
SedgeHammer is usually our top pick for St. Augustine and Bermuda when used correctly. It works slowly, so do not panic if nothing dramatic happens the next day. It may take a couple of weeks to really show results.
Dismiss tends to show visual results faster, which some people like, but heavy infestations may still need follow-up treatments.
And this is important:
You need a surfactant unless the product already includes one.
Nutsedge has a waxy, shiny leaf. If you spray without a surfactant, the product can bead up and roll off instead of sticking and absorbing.
That is one of the biggest reasons people say, “I tried that and it didn’t work.”
The product may have been right.
The timing may have been right.
But the surfactant was missing.
General rules:
✅ Spray when it is actively growing.
✅ Do not mow right before or right after treatment.
✅ Do not spray before rain.
✅ Give it time.
✅ Expect repeat applications.
✅ Always read and follow the label.
✅ Fix wet spots or irrigation problems, because nutsedge loves moisture.
This is not usually a one-and-done w**d.
If you have a heavy infestation, you are not just killing what you see today. You are trying to reduce what is waiting underground for the next round.
That takes patience.
Now, what about nutsedge in flower beds, vegetable gardens, roses, herbs, containers, or right next to plants you actually like?
This is where we do NOT want you spraying wildly.
This is where we use the “Q-tip method.”
Mix the product according to the label. Wear gloves. Use a cotton swab or small foam brush. Wipe the solution directly onto the nutsedge leaves without touching the desirable plant.
It is slow. It is tedious. It is not glamorous.
But it is precise.
And sometimes precision is the whole point.
Especially near tomatoes, herbs, flowers, roses, or anything you do not want accidentally damaged.
So here is the short version:
If it is bright green, grows faster than the lawn, has a triangular stem, and keeps coming back after you pull it — you are probably dealing with nutsedge.
Do not pull it.
Do not use w**d-and-feed.
Do not use a random broadleaf w**d killer.
Use a sedge-specific product, use a surfactant, follow the label, and expect more than one round.
And if it has a round little ball seed head instead of an umbrella-looking one, it may be Kyllinga — which is related and treated similarly, but still worth identifying correctly.
Now, here is the new part.
We are building the Ask Garden Guy Library off Facebook.
For the first time, we are going to give you the option to click out and read the full guide if you want the deeper version with product notes, pictures, and more detail.
You do NOT have to click out.
We know some of y’all prefer to stay right here, and we are not mad about it. We will keep writing the robust Facebook posts like we always have, because that is what you are used to and honestly, that is how this whole thing grew.
But over the next month, we are building a real library for you at Ask Garden Guy — organized by common Houston lawn and garden problems — so when you need to find something later, it is not buried under 742 Facebook comments, three rainstorms, and a post about somebody’s rose bush.
So here is the full nutsedge/nutgrass guide if you want it:
www.askgardenguy.com/houston-garden-tips/how-to-kill-nutsedge-nutgrass-houston
We hope this new library becomes something you can actually use.
And if you don’t want to click out?
That’s fine too.
We’ll still be right here, talking about nutgrass for the 900th time like the glamorous lawn influencers we never planned to become.
— Todd & Sabrina
Ask Garden Guy
