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You Missed Pre-Emergent Crabgrass in Central Ohio. Here Is Your April Rescue Plan.


If you did not apply a pre-emergent herbicide in late March or early April, the crabgrass seeds sitting in your soil across Circleville, Columbus, Lancaster, and Chillicothe are about to start germinating this week. Once they do, pre-emergent does nothing. But the season is not lost. There is a narrow rescue window right now, and a handful of post-emergent tools that still work if you move fast.


Here is what to do this week.


The soil temperature reality


Crabgrass germinates when soil temperatures at 2 inches of depth hit 55 degrees for four to five days straight. Central Ohio soil crossed 50 on April 10. We are about 5 to 7 days away from 55 in Circleville and Columbus, maybe already there in Chillicothe at the south end of the service area.


If forsythia in your neighborhood has dropped its yellow flowers and the shrubs are leafing out, the soil is at or past crabgrass germination temperature. You are out of pre-emergent window.


Window 1: Dithiopyr this week (the narrow escape)


Dithiopyr (common brand: Dimension) is the one pre-emergent that ALSO kills crabgrass that has just cracked the soil but has not yet developed multiple leaves. It buys you about 10 to 14 extra days of application window compared to Prodiamine or Pendimethalin.


If the forsythia in your neighborhood is still in bloom or just starting to drop, get a dithiopyr product on the lawn this week. Granular is easiest for homeowners — spread per label rate, water in with a quarter inch, and the barrier goes into place while simultaneously catching the earliest germinated plants.


Cost: 25 to 40 dollars for enough product to cover a standard Central Ohio residential lot.


Window 2: Post-emergent quinclorac (when you are late)


If forsythia has dropped completely, dithiopyr is too late. Switch to a post-emergent product with quinclorac as the active ingredient (common brand: Drive XLR8, Tenacity).


Quinclorac kills existing crabgrass plants that have emerged but are still young (4 tillers or less). Older plants are harder to control. That is why the timing matters — every week you wait past first emergence, control rate drops.


Application rules: spray on a non-windy day above 60 degrees, do not mow for 24 hours before or after, water lightly (quarter inch) 48 hours after to push the chemical down into the crown. Two applications spaced 14 days apart hit both first and second germination waves.


Cost: 30 to 50 dollars for homeowner-grade concentrate that treats a half-acre twice.


Window 3: Overseed into thin areas (the long game)


Crabgrass thrives where your turf is thin. The real permanent fix is a dense, healthy lawn that crowds out crabgrass seeds before they can establish. That is fall overseeding work — but the prep starts now.


Walk the lawn this week and mark thin spots with landscape flags. Those get aggressive overseeding in September, combined with core aeration. Homeowners who overseed in fall see 70 to 80 percent crabgrass reduction the following year.


We bundle aeration, overseeding, and starter fertilizer into fall renovation packages for most Central Ohio residential properties. Commercial properties get full seasonal contracts that handle the calendar for you.


What NOT to do this week


Do not apply regular pre-emergent now. If forsythia is past bloom, pre-emergent alone is wasted money. Save it for next March.


Do not mow before application. Post-emergent herbicides work on leaf surface area. Mowing 24 hours before a spray drops effectiveness by up to 40 percent.


Do not seed where you apply herbicide. Both pre-emergent and post-emergent products can prevent new grass seed from germinating for 3 to 6 weeks.


Do not apply in cold weather. Below 60 degrees, the chemical does not translocate into the plant properly. If the forecast shows a cold snap, wait it out.


Other services worth pairing this week


If you are already out there treating the lawn, this is the right week to also handle:


Mulch install — fresh 2-to-3 inch hardwood or dyed black on beds suppresses the same weed seeds that crabgrass preventer misses. Window closes late May.


First hedge trim — boxwood, arborvitae, and privet are in the exact sweet spot right now.


Power washing — driveway, sidewalk, fence, siding. Removes the pollen layer that settles all over hardscape in April.


Stump grinding — spring ground conditions are ideal for efficient grinding. Cheaper now than summer.


The takeaway


If you missed the pre-emergent window: dithiopyr this week catches the earliest germinators. If you are fully past the window, post-emergent quinclorac kills young crabgrass in May. Either way, overseed and aerate this fall to make crabgrass irrelevant next year.


If you do not want to track herbicide timing windows every spring, we handle the full seasonal calendar — pre-emergent, broadleaf, summer weed pressure, fall fertilizer, overseeding, aeration, and everything between — as part of our full-property maintenance contracts. Mowing starts at 40 dollars a visit.


Get a free quote for your property — takes about 60 seconds.


Get Your Free Lawn Care Quote for Central Ohio: https://quick-mow-quote.emergent.host/


Call or Text: 614-425-9789





Serving Circleville · Columbus · Lancaster · Chillicothe · Central Ohio



 
 
 

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