What Herbicide Kills Sand Spurs
Sand spurs (also called sandbur, devil’s spurs, or Cenchrus species) are those nasty little spiny burs that make walking barefoot across a yard a painful experience. If you’re fighting them in a lawn, garden path, or a sandy patch, you’re probably asking: what herbicide will actually kill these weeds? I’ve managed sand spurs in my own yard for years, so here’s a gardener’s guide to what works, what doesn’t, and how to use herbicides safely and effectively.
Understand the enemy: what sand spurs are and why herbicide choice matters
Sand spurs are annual grassy weeds that produce hard, spiny seed burs. They germinate from seed, grow through the season, set seed in late summer or fall, and then die. Because they’re grasses, broadleaf weed killers (like 2,4-D) won’t touch them. That means you need either a pre-emergent to stop the seed from sprouting or a grass-targeting post-emergent herbicide — or simply spot-kill them with a nonselective herbicide.
Herbicides that kill sand spurs
Here are the main herbicide categories and specific active ingredients that will control sand spurs. Every product label is the rulebook — always check it for your turf type and local restrictions.
- Pre-emergent herbicides — best for prevention. Apply before sand spur seeds germinate in spring.
- Prodiamine (brand example: Barricade)
- Dithiopyr (example: Dimension)
- Pendimethalin (example: Pendulum)
- Non-selective post-emergent herbicide — for spot-killing mature plants.
- Glyphosate (Roundup and many generics) — will kill any plant it touches, including grass. Excellent for spot treatments on driveways, paths, or when you want to remove plants completely.
- Selective grass-killing post-emergents — for treating sand spurs in lawns without killing desired broadleaf plants.
- Sethoxydim (example: Poast)
- Fluazifop (example: Fusilade)
- Fenoxaprop (example: Acclaim)
- Older or restricted options
- MSMA was once widely used for grassy weeds like sandspurs but is restricted or limited in some regions. Check local rules before considering it.
Which option should you choose?
Simple answer: it depends on where the sand spurs are and what kind of lawn you have.
- If you want prevention: use a pre-emergent (prodiamine or dithiopyr) in late winter or very early spring, before soil temperatures trigger germination.
- If you have a few plants in a non-lawn area: spot-treat with glyphosate. Paint it on or use a targeted sprayer to avoid collateral damage.
- If sand spurs are in your lawn: use a selective grass herbicide labeled for your turf type (sethoxydim, fluazifop, fenoxaprop). These will kill the sand spurs without harming many broadleaf plants, but compatibility varies by grass species — read the label.
Application tips from my garden
I learned the hard way that timing and technique matter as much as the chemical you pick. A few practical tips I use every season:
- Apply pre-emergent early — I set a calendar and spray when soil temps reach about 55°F for several days. That single spring application reduces burrs later in summer.
- For post-emergent work, treat young, actively growing sand spurs. Small plants are much easier to control than mature, seed-setting ones.
- When using glyphosate, spot-spray on calm days and use a piece of cardboard as a shield if the target is near desirable plants.
- Follow label rates exactly. More is not better and can harm the lawn, environment, or your wallet.
“A single well-timed pre-emergent plus good lawn care cut my sand spur problem by more than half in one season.” — A gardener who learned to plan
Non-chemical and cultural controls to combine with herbicides
Herbicides work best as part of an integrated approach. I always combine treatment with cultural fixes to make the lawn hostile to sand spurs.
- Hand-pull or dig out plants before burs form. Wear gloves — those spines are ruthless.
- Raise mower height to encourage a dense turf that shades out seedlings.
- Overseed thin areas in fall to fill gaps where sand spurs like to gain a foothold.
- Improve fertility and watering schedules so your turf is vigorous and competitive.
- Mulch or landscape fabric in beds and bare sandy patches to prevent seed contact with soil.
Safety, regulations, and final recommendations
Always check your herbicide label and local regulations. Some active ingredients may be restricted where you live. Wear protective gear, avoid spraying on windy days, and keep pets and children away from treated areas until the product has dried or the label indicates it’s safe.
My bottom line recommendation: For long-term control, use a pre-emergent like prodiamine in spring to stop germination. For current plants, use a targeted selective grass herbicide if you need to protect surrounding vegetation, or glyphosate for stubborn patches and non-lawn areas. Combine chemical control with good lawn care practices to keep sand spurs from ever getting a foothold again.
Quick reference
- Prevent: Prodiamine, dithiopyr, pendimethalin (pre-emergents)
- Kill existing plants: Glyphosate (spot-treat) or selective grass herbicides like sethoxydim, fluazifop, fenoxaprop (if labeled for your turf)
- Do not use broadleaf-only herbicides (e.g., 2,4-D) — they won’t kill sand spurs
Fight smart, not frantic. With the right herbicide, a little timing, and steady lawn care, those painful little burs will become a seasonal memory instead of a yearly battle.
