Best Weed Killer for Bermuda Grass: What Each Misses

Bermuda is one of the most herbicide-tolerant lawns you can own — which means your options are wide, and the difference between products comes down to which weeds, how fast, and cost per thousand square feet. Here’s what actually works.

If your lawn is St. Augustine rather than bermuda, almost none of this transfers — the two grasses tolerate opposite chemistry families. See best weed killer for st augustine.

If the lawn is centipede rather than bermuda, almost none of this transfers: that species is 2,4-D sensitive and wants a single pound of nitrogen a year. See best weed killer for centipede.

Zoysia tolerates a similarly wide range but recovers from injury far more slowly, which changes the cost of a mistake — see best weed killer for zoysia.

How We Picked

We compared active ingredients against the weeds Bermuda owners actually fight — crabgrass, dallisgrass, nutsedge, spurge and clover — and scored each product on selectivity (no Bermuda injury at labeled rates), speed of visible results, coverage cost, and ease of application for a homeowner without a commercial license.

Will This Product Hurt My Bermuda?

If you arrived holding a bottle rather than shopping for one, this is the section you want, and the answer is unusually simple for Bermuda owners.

Texas A&M’s homeowner tolerance table rates nine common lawn herbicide actives against five turfgrass species. Bermudagrass is rated tolerant of every one of them except atrazine. That is the whole safety question on a Bermuda lawn: not “is this product safe”, but “does it contain atrazine”.

Texas A&M defines T as generally tolerant and NR as “generally not recommended for that particular species of turfgrass due to the high risk of injury or death”, adding that you should not use a product if your turfgrass is not listed on the label as tolerant. On atrazine specifically the guide is blunt: “Injury is very likely on bermudagrass lawns.”

The trap this creates

Atrazine is the active manufacturers reach for when they build a product for St. Augustine and centipede — the two grasses that cannot take the chemistry Bermuda handles easily. So the same brand ends up on the shelf twice, in near-identical bottles, with opposite answers for your lawn. Texas A&M names Weed B Gon, Image and Weed Stop as brands that all sell an atrazine version aimed at St. Augustine.

That is why “will Weed B Gon kill Bermuda?” and “will Image kill Bermuda?” have no single answer. The ordinary bottles are fine. The one with “for St. Augustinegrass” on the front is the one that hurts you — and it is usually shelved right beside it.

One check, every time: read the active ingredients panel on the back and look for atrazine. If it is not there, the table above says you are almost certainly fine.

The Top Picks

One label check before any of these, because a brand name is not a formulation. Ortho sells more than one Weed B Gon, and they do not agree about your lawn. The ordinary bottle and the “plus crabgrass” version below are built on 2,4-D, dicamba and quinclorac, which Texas A&M’s tolerance table rates T — tolerant — on Bermudagrass. The version sold for St. Augustinegrass is built on atrazine, which the same table rates NR on Bermudagrass: “not recommended for that particular species of turfgrass” because “the turfgrass species is not included on the label as a tolerant species.” Same shelf, same brand, opposite answer. Turn the bottle over.

Head-to-Head

When to Apply on Bermuda

And if bermuda is the weed rather than the lawn — spreading into a fescue or bluegrass lawn — that is the opposite problem and a different programme: how to kill bermuda grass in a fescue lawn.

Timing matters as much as product choice:

• Full green-up first — spraying half-dormant spring Bermuda causes injury and poor uptake. Wait until the lawn is uniformly green and growing.
• Under 85–90°F for 2,4-D-based products, whose labels usually say so outright. Celsius carries no blanket high-temperature prohibition, but it is not unrestricted either: its label says do not use a spray adjuvant above 90°F, and that spot treatments on St. Augustine above 90°F may cause temporary growth regulation. Full detail in spraying weed killer in hot weather.
• Young weeds die easier — a 2-inch crabgrass seedling needs one pass; an August monster with tillers may shrug off three.
• No mowing 2 days before or after — the herbicide needs leaf surface to work.

Weeds and Rules in Missouri

Missouri's dominant lawn grass is Turf-Type Tall Fescue, with bermuda as one of the grasses grown alongside it. The atrazine bottles are aimed at St. Augustine and centipede, and neither is much grown here — so that particular trap is milder in Missouri than the Gulf states. The local complication is the other one: in a Turf-Type Tall Fescue state, bermuda is as often the weed as the lawn, and the two jobs share a shelf. If yours is spreading into fescue rather than growing as your lawn, you want the opposite programme. Grasses grown here: Turf-Type Tall Fescue, Zoysia (Missouri is the state that made Meyer zoysia a lawn grass), Kentucky Bluegrass, Bermuda (the Bootheel and southwest), Fine Fescue (shade).

What Missouri actually has

A shortlist is only useful against the weeds in front of you. These are the high-pressure weeds Missouri's own research records, each against the active that handles it on bermuda:

Missouri's high-pressure weeds	What handles it on bermuda
Crabgrass	Quinclorac, rated T on bermudagrass — the active that plain broadleaf bottles are missing.
Nimblewill (a Missouri signature — perennial, and no selective bottle removes it from fescue)	A perennial grass in a grass lawn: suppression at best, and renovation is often the cheaper answer.
Henbit	A standard three-way — 2,4-D, dicamba, MCPP — all rated T on bermudagrass.
Dandelion	A standard three-way — 2,4-D, dicamba, MCPP — all rated T on bermudagrass.
White clover	A standard three-way — 2,4-D, dicamba, MCPP — all rated T on bermudagrass.
Nutsedge (claypan ground that stays wet)	Sedge chemistry only — halosulfuron, sulfentrazone or imazaquin. Broadleaf and crabgrass bottles do not touch it.

What Missouri restricts

The tolerance table says what your grass survives. It does not say what you are allowed to buy, and that is a state question. Missouri's recorded restrictions:

• No statewide lawn fertilizer blackout, but MU Extension bases every phosphorus recommendation on a soil test rather than a default rate
• MSMA is banned for residential turf nationwide — Missouri's nimblewill and dallisgrass problems have no easy chemical answer

The MSMA line is the one that changes a recommendation on this page. MSMA was the standard homeowner answer to dallisgrass and it is no longer available for residential turf here — so a dallisgrass verdict of "suppression, or renovate" is not us being pessimistic, it is what is left on the shelf. The authority is Missouri Department of Agriculture, Bureau of Pesticide Control: Missouri Department of Agriculture. Our state product restrictions tool carries the same data in a searchable form.

When to spray in Missouri

The two prohibitions above — no half-dormant spring lawn, nothing above 85–90 °F for 2,4-D products — close most of Missouri's calendar on their own. What is left is the state's own post-emergent window: April–May and September–October; skip summer sprays on drought-stressed fescue.

Green-up is the front edge of it, and the frost record is how you find it here: Missouri's last frost is Late April (north) to late March (Bootheel), and bermuda does not finish greening up on that date — it finishes weeks later, once soil temperatures hold. Spraying the half-green lawn in between is the injury nobody blames on timing. The pre-emergent window that would have prevented most of this runs Late March in the Bootheel to mid-April along the Iowa line — soil 55°F moves south to north across about three weeks.

What the weather does to the dose in Missouri

Every product above is a foliar spray, so it has to stay on the leaf long enough to move into the plant — and that is a local variable rather than a label one. Missouri's rainfall pattern: Spring-heavy (~40 in northwest to ~48 in southeast) with reliable mid-summer dry spells that push fescue into dormancy.

That pattern is easier to plan a spray around than the Gulf states' afternoon storms — frontal rain gives you a forecast you can act on, and a dry window long enough for uptake is usually visible a day ahead. The failure mode here is the opposite one: a dry spell before the spray, because a drought-stressed weed takes up less herbicide and a stressed bermuda takes more injury from the same dose.

And the soil decides what the pre-emergent half of the plan can do: Claypan silt loams across the northern and central plains, cherty rocky ground through the Ozarks, and deep loess along the Missouri and Mississippi bluffs. A heavier profile holds a pre-emergent barrier well, which is what makes the prevention section below the cheapest part of this page rather than an aspiration.

Prevention Beats Spraying

The cheapest weed killer for Bermuda is Bermuda itself. Mowed low and often, fed a pound of nitrogen per thousand square feet per growing month, a Bermuda lawn forms a canopy so dense that weed seedlings never see daylight. Pair a spring pre-emergent with a healthy feeding schedule and most of the products above become a once-a-season spot treatment, not a monthly ritual.

That density starts with mowing height and a feeding calendar — Bermuda grass care covers both.

If Your Lawn Isn’t Bermuda

Bermuda’s tolerance is unusually wide, so a shortlist built for it will injure several other lawns. The chemistry-by-weed comparison for every grass type is in best weed killer for lawns, and if you would rather avoid synthetic hormone herbicides altogether — or you have moss, which none of the products above touch — see organic weed killers for lawns.

Celsius is also one of the products Clemson names by name for wild onion and wild garlic on bermuda, zoysia and centipede — see how to get rid of wild onions for the timing those clumps actually require.