Will a Weed Burner Kill Nutgrass? No - And Here's Why Not

We'll save you the money on this one. A weed burner will not kill nutgrass. Not with one pass, not with ten, not with a bigger burner.

And nutgrass is worth understanding properly, because it's the weed that most often makes people think a tool is faulty when it isn't.

Why surface heat does nothing

Most weeds you can beat by taking the top off, because the top is where the plant lives. Nutgrass isn't built that way.

Each nutgrass plant forms a basal bulb sitting roughly 7 to 18cm below the soil surface, and that bulb — not the leaves — is where the growing point lives. Cut, mow, spray-fail or flame the leaves off at ground level and the growing point is completely untouched. It simply pushes another set of leaves up. That's why it seems to laugh at everything.

Underneath that, it runs a network of rhizomes and chains of tubers — the "nuts" it's named for. The fibrous roots can go down more than a metre. Dormant tubers commonly sit in the soil for three to four years and can stay viable for up to ten years in good conditions. Tubers get more dormant the deeper they are, and they can still shoot from under a metre of soil.

So even in the fantasy where you sterilised the top 50mm of soil, you'd have barely scratched the population.

The bit that catches people out

Here's the cruel part: disturbing nutgrass usually makes it worse. Digging, rotary hoeing and cultivating break the tuber chains and drag pieces around, and every fragment is a new plant somewhere new. Plenty of people have turned a patch into a paddock by attacking it with machinery.

Flame at least doesn't spread it. But "doesn't make it worse" is a long way from "kills it".

What actually works

The only thing that beats nutgrass is targeting the tubers, and that means playing a long game rather than a hard one.

• Exhaustion. Every time the plant pushes leaves up it spends tuber reserves. Remove that growth relentlessly — every couple of weeks, without gaps, over a whole season and usually more than one — and you slowly drain the tubers. Consistency beats intensity here more than with any other weed.
• Don't cultivate it. You'll spread it. If a patch is contained, keep it contained.
• Competition and shade. Nutgrass does badly under dense established cover. Getting something vigorous over the top of it helps.
• Solarisation can work on a small, contained patch, but it needs real heat, real time and full coverage — and it kills everything else in that ground too.
• Selective herbicides exist for nutgrass specifically and are what commercial growers reach for. We sell chemical-free tools and we're still going to tell you that, because pretending otherwise wastes your season.

Whatever route you take, plan in years. Anyone offering a one-season fix for nutgrass is selling something.

So where does a burner fit?

Honestly, nowhere useful for nutgrass specifically. If you've got nutgrass through a gravel driveway and you're flaming the driveway anyway for everything else, the nutgrass leaves will die back with the rest of it and you'll be knocking it back rather than killing it. That's suppression, and it's a side effect of a job you were doing regardless — not a reason to buy the tool.

If nutgrass is your main problem, a weed burner is not your answer, and we'd rather tell you that now than take your order and refund it in a month under our 30-Day Weed-Free Guarantee.

What a burner is actually good at

Annual broadleaf weeds with everything above ground: capeweed, fireweed, Paterson's curse, thistle seedlings. Young growth of almost anything. And any hard surface — driveways, gravel, pavers, around tanks and sheds, along fencelines — where you can't or won't spray.

Different weed, different tool. That's the whole point of being straight about it.

Short version

No. Nutgrass keeps its growing point 7–18cm underground and banks tubers that stay alive for up to a decade. Surface heat can't reach any of it. Don't cultivate it either — you'll spread it. Relentless removal of top growth over multiple seasons, competition, or a nutgrass-specific selective herbicide are the realistic options.

For the straight verdict on other weeds, see our weed-by-weed guide, or ring us on +61 449 268 131 and describe what you're looking at.