Product Reviews
Best Weed Killer for Bermuda Grass: What Each Misses
The best weed killer for Bermuda grass depends on the weed — and Bermuda tolerates chemistries that would scorch St. Augustine. What each option misses.
Professional Post-Emergent Herbicide
Prime Source Celsius WG Easy Mix Packet Review
★★★★★ 4.7/5
our editor rating how we score4.4/5 from 1,399 shoppers at Amazon — their number, not ours.
$15–$20
Typical price · One 0.226 oz packet treats roughly 1,000 sq ft
Affiliate links — see our disclosure. Commissions never influence verdicts.
The same Celsius WG chemistry in a single-dose packet — heat-safe on warm-season turf, with no bulk purchase and no scale required.
Our Verdict
The sensible way to try Celsius without committing to a professional-size bottle. One packet handles a spot problem; if you are treating a whole lawn every year, the larger container works out far cheaper per 1,000 sq ft.
✅ Pros
- No high-temperature injury window — sprayable in summer heat
- Controls 150+ weeds including doveweed and Virginia buttonweed
- Tiny use rates: one bottle lasts a typical lawn for years
- Safe on Bermuda, St. Augustine, Zoysia and Centipede
⚠️ Cons
- Single-dose packet — expensive per 1,000 sq ft compared with the bulk bottle
- Needs a sprayer and a non-ionic surfactant
- Not for cool-season lawns — warm-season turf only
Product type
Professional Post-Emergent Herbicide
Active ingredient
Iodosulfuron + Thiencarbazone + Dicamba
Price range
$15–$20
Coverage
One 0.226 oz packet treats roughly 1,000 sq ft
Best for
Stubborn weeds and hot-weather applications on warm-season turf
our editor rating
4.7 out of 5
Where our facts come from
Label read on EPA's label database
EPA Reg. No. 432-1507
We opened this product's accepted label on EPA's own Pesticide Product Label System — the strongest source available for what a product is registered to do.
What we found when we read it
Label read 2026-08-02: thiencarbazone-methyl 8.7%, iodosulfuron-methyl-sodium 1.9%, dicamba 57.4%. Registrant is 432 (Envu, formerly Bayer Environmental Science); the Amazon listing title reads 'Prime Source Celsius WG', so BRAND here follows the listing while the registration follows the label — a distributor sub-registration may apply to the packet. Label restriction our articles already state correctly: DO NOT use on bahiagrass, seashore paspalum, or cool-season turf including tall fescue, fine fescue, Kentucky bluegrass, perennial ryegrass or creeping bentgrass. TEMPERATURE, read again 2026-08-02 because our articles were overstating it: the label carries NO blanket high-temperature prohibition of the kind 2,4-D turf labels carry, but it is not unrestricted — 'DO NOT use a spray adjuvant at temperatures above 90 degrees', and 'Spot treatments to St. Augustinegrass turf at temperatures above 90 degrees may cause temporary growth regulation'. It also notes temporary discoloration of warm-season grasses under stress from drought, disease or extreme cold or hot weather, and slower symptom development below 65 degrees soil temperature. 'The exception for hot weather' was too strong and has been corrected in best-weed-killer-for-bermuda-grass.mdx.
Where this page and the container disagree, the container wins — the label is the legal authority on rates and restrictions. How to read one yourself.
Where This Product Matters
Matched against each state's actual disease, weed and pest pressure.
Alabama
Alabama hub →CrabgrassDoveweed (late-germinating, and the standard three-way does not touch it)Virginia buttonweedDollarweed (pennywort) on wet coastal ground
Application window: April–May and September, and check every label against centipede before it leaves the shelf
Arizona
Arizona hub →Crabgrass
Application window: March–May and during monsoon flushes; Celsius-type products handle 100°F+ windows
Arkansas
Arkansas hub →CrabgrassHenbitVirginia buttonweed
Application window: Bounded by the label's temperature ceiling rather than the calendar — spring treatments finish before the June heat arrives, and nothing selective goes down again until September cools off
California
California hub →Crabgrass
Application window: March–May while weeds are young; avoid spraying drought-stressed turf in summer
Colorado
Colorado hub →Crabgrass
Application window: May–June and September; high-altitude sun makes stressed turf easy to injure, so spot-treat rather than blanket-spray
Connecticut
Connecticut hub →Crabgrass
Application window: Broadleaf sprays in May–June and again in September, when the weeds are moving sugars to the roots; skip July and August, when a stressed cool-season lawn takes the injury and the weed does not
Delaware
Delaware hub →Crabgrass
Application window: April to late May, then September into October. Skip July and August entirely: this is the transition zone, and a stressed tall fescue lawn takes the injury the weed shrugs off
Florida
Florida hub →Dollarweed (pennywort)DoveweedFlorida pusleyCrabgrassChamberbitter
Application window: March–May and October–November; avoid applications above 85°F
Georgia
Georgia hub →CrabgrassDoveweedVirginia buttonweed
Application window: April to early June and September–October; avoid mid-summer sprays on stressed turf
Hawaii
Hawaii hub →CrabgrassDollarweed on over-watered turf
Application window: Year-round where the turf is actively growing, which is most of the time; the constraint is heat and drought stress on the leeward side rather than a dormant season
Idaho
Idaho hub →Crabgrass in the warmer southern valleys
Application window: Late April into June, then September into October; skip the July and early August heat, which is also when UI's own fertilizer schedule goes quiet
Illinois
Illinois hub →Crabgrass
Application window: May–June and September; fall beats creeping charlie best
Indiana
Indiana hub →Crabgrass
Application window: October is the most effective month for broadleaf weeds; never apply above 80°F or to drought-stressed turf
Iowa
Iowa hub →Crabgrass
Application window: October, and October is most of it — but check the wind and the date against what is happening in the fields, because early-summer growth-regulator drift is a real seasonal risk here and your own spray carries the same way
Kansas
Kansas hub →CrabgrassHenbit and other winter annuals, which own an eastern Kansas lawn in March
Application window: April into May and again in September–October; avoid July and August, when a tall fescue lawn here is already at its limit
Kentucky
Kentucky hub →CrabgrassHenbit
Application window: April–May and September–October; autumn is the knockout window for the wild garlic that defines a Kentucky winter lawn
Louisiana
Louisiana hub →Dollarweed (pennywort)DoveweedVirginia buttonweed
Application window: March–May and October–November; avoid applications above 85°F and never on drought-stressed St. Augustine
Maine
Maine hub →Crabgrass (southern and coastal Maine more than the interior)
Application window: June, then a narrow late-August to mid-September window. Maine's usable autumn is the shortest in New England
Maryland
Maryland hub →Crabgrass
Application window: April–May and September–October; autumn is the knockout window for the ground ivy and violet the Piedmont is full of
Massachusetts
Massachusetts hub →Crabgrass
Application window: A narrow autumn is the real window here: late September into October, after the summer heat and before New England's early frost closes the season
Michigan
Michigan hub →Crabgrass
Application window: May–June and September; autumn is the stronger window for perennial broadleaf weeds
Minnesota
Minnesota hub →Crabgrass
Application window: Late May–June and September; autumn is the stronger window for perennial broadleaf weeds
Mississippi
Mississippi hub →CrabgrassDollarweed (pennywort) wherever drainage is poorDoveweedVirginia buttonweed
Application window: April–May and September, avoiding the midsummer heat restrictions on most labels
Missouri
Missouri hub →CrabgrassHenbit
Application window: April–May and September–October; skip summer sprays on drought-stressed fescue
Montana
Montana hub →Crabgrass and foxtail in the warmer valleys and in thin ground
Application window: June, then late August into September. In a sub-100-day valley there is no third chance
Nebraska
Nebraska hub →CrabgrassHenbit and other winter annuals
Application window: Late spring and again from late August through September, when perennial broadleaf weeds are moving reserves to the root
Nevada
Nevada hub →Crabgrass
Application window: March–April and October in the south; May and September in the north
New Hampshire
New Hampshire hub →Crabgrass (heaviest in the south, thinning northward)
Application window: Late May into June, then late August through September. The autumn window closes earlier here than anywhere else in southern New England
New Jersey
New Jersey hub →Crabgrass
Application window: May and September–October; autumn is the knockout window for perennial broadleaf weeds
New Mexico
New Mexico hub →Crabgrass in irrigated turf
Application window: Spring and early autumn; in the south skip the June heat entirely, and in the north the usable autumn window closes by early October
New York
New York hub →Crabgrass
Application window: May and September–October; autumn is the knockout window for perennial broadleaf weeds
North Carolina
North Carolina hub →CrabgrassHenbit
Application window: April–May and September–October; avoid spraying heat-stressed fescue in July–August
North Dakota
North Dakota hub →Crabgrass, real but a smaller problem than further south
Application window: Early to mid-June, then late August into early September. There is no third opportunity
Ohio
Ohio hub →Crabgrass
Application window: May–June and September; fall applications hit dandelion taproots hardest
Oklahoma
Oklahoma hub →CrabgrassSandbur (the western sandy-soil weed that standard crabgrass preventers do not list)Henbit
Application window: Judged by wind before season: sustained wind is Oklahoma's normal condition, so the usable spray days are calm mornings in April, May and September rather than whole months
Oregon
Oregon hub →Crabgrass (east side and hot summers only)
Application window: March–May and September–October; the long mild shoulder seasons give more usable spray days than most states get
Pennsylvania
Pennsylvania hub →Crabgrass
Application window: May and September — fall is the knockout window for perennial broadleaf weeds
Rhode Island
Rhode Island hub →Crabgrass
Application window: Broadleaf work in May–June and again in September; the September pass is the one that holds, because the weed is moving reserves down
South Carolina
South Carolina hub →CrabgrassDollarweed
Application window: April–May and September–October, and never above 90°F — centipedegrass is sensitive to 2,4-D both at spring green-up and in summer heat
South Dakota
South Dakota hub →Crabgrass and foxtail in thin or disturbed ground
Application window: Early to mid-June, then late August into September, which is the pass that actually holds on perennial broadleaf weeds
Tennessee
Tennessee hub →Dallisgrass (a perennial the quinclorac that clears crabgrass will not touch)CrabgrassHenbit
Application window: April–May and September–October; skip sprays on drought-stressed summer fescue
Texas
Texas hub →CrabgrassHenbit
Application window: April–early June and September–October; avoid herbicides above 90°F
Utah
Utah hub →Crabgrass
Application window: May and September, avoiding the intense midsummer heat on the label
Vermont
Vermont hub →Crabgrass (a valley problem more than a hill-town one)
Application window: Late May through June, then a short late-August to mid-September window. Vermont's autumn window is the narrowest in New England
Virginia
Virginia hub →Crabgrass
Application window: April–May and September–October; skip sprays on heat-stressed fescue in July and August
West Virginia
West Virginia hub →Crabgrass
Application window: April into May and again in September–October. Skip July and August: this is transition-zone country and a heat-stressed tall fescue lawn absorbs the injury the weed does not
Wisconsin
Wisconsin hub →Crabgrass
Application window: Early to mid-fall is the favourable window for dandelion and other perennial broadleaf weeds
Common questions
Common Questions
How much does Prime Source Celsius WG Easy Mix Packet cost?
Prime Source Celsius WG Easy Mix Packet typically runs $15–$20, covering One 0.226 oz packet treats roughly 1,000 sq ft.
What does Prime Source Celsius WG Easy Mix Packet treat?
Prime Source Celsius WG Easy Mix Packet targets Doveweed, Dollarweed, Virginia buttonweed, Crabgrass, Chamberbitter, Florida pusley, among others.
What is the active ingredient in Prime Source Celsius WG Easy Mix Packet?
Iodosulfuron + Thiencarbazone + Dicamba, registered under EPA Reg. No. 432-1507.
What is the biggest downside of Prime Source Celsius WG Easy Mix Packet?
Single-dose packet — expensive per 1,000 sq ft compared with the bulk bottle
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