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Pre-Emergent Herbicides

Pre-emergent Herbicides

Pre-emergent Herbicides are the best way to reduce and eliminate weeds in your lawn. Pre-emergent Herbicides work by preventing weed seed germination. They create a layer that kills the weeds as they try to push past the top layer of soil.

The key to using pre-emergent herbicides is proper timing.  There are two times of the year to apply your pre-emergent herbicides, the spring and the fall.   When to apply these during that time period depends on your geographic location, you can contact your local county extension for the best times to apply.   Most spring and summer weeds will germinate when the soil temperature at 4 inches down reaches about 52 to 55 degrees F for three or four consecutive days.

Some popular weeds that can be effectively controlled by pre-emergents include but are not limited to:

Spring Application

Early Spring Application:  Many of the pre-emergent herbicides have similar qualities and control the same broad and grassy weeds.  When applied at the correct time they are very effective and we recommend our top products such as these:

Other products include:

Late Spring Application:  If you are applying pre-emergent later in the season, the best option would be to use pre-emergents that have post emergent qualities to control the seeds that have already germinated and have already sprouted.  Our top products include:

Other products include:

Spring Application Chart

Pre-emergent herbicide spring application map

 *temperatures vary year to year so optimal application could vary from these dates


Fall Application

Early Fall Application:  When applying pre-emergents in late summer and early fall we would recommend using the same products as Late Spring Application.  This way you can control the already existing weeds and prevent any further growth. 

Mid to Late Fall Application:  When applying pre-emergents in this part of the year we would recommend using the same products as Early Spring Application.  

An Interactive Soil Temperature Map by Syngenta is a handy tool.

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  1. Surflan AS -2.5 Gallons

    Out of stock

    Effective pre-emergent seed and weed control on a broad spectrum of weeds and grasses. Standard rate-Turf Grass - Apply now in early spring up to summer, prevents weeds from germinating. Tank can be mixed with any glyphosate, kills weeds on top of ground and prevents weeds from germinating. Please be careful with glyphosate(same active percentage as Round Up) with anything green as Glyphosate will kill it. It will take 1.5 - 2 quarts of Surflan to treat an acre for turf grass( 1.5 oz / 1 gallon of water , See label for complete instructions). Applications will vary based on the rate used during the treatment. For long growing warm regions, a stronger rate will provide a longer window of protection. At the low rate, you can expect 2-4 months of residual. Higher rates can yield 6-12 months of activity. Do not reseed for 90 - 180 days following application as seed germination may be negatively affected.

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  2. Oryzalin 4 Pro -2.5 container

    Starting at: $31.95

    Out of stock

    ORYZALIN 4 PRO (41% Oryzalin)- Generic equivalent for Surflan AS
    Oryzalin 4 Pro , a pre-emergent weed control is a cost-effective, long-lasting (2-8 months) control of annual grasses and selected broadleaf weeds in ornamentals (container and field grown), commercial landscaping, and warm season turf. To be used in non-crop site vegetation control,Christmas tree plantations, around roadsides and railroads.

    It is a Excellent tank mix partner with Round Up (Glyphosate)for even broader spectrum weed control.
    It can be used on over 400 species of ornamentals and warm season grasses. Pre-emergent weed control that may be used in combination with glyphosate for weeds that have already emerged. Its active ingredient is Oryzalin.
    Oryzalin is applied to soil surface and should be activated within 21 days with rain or irrigation. Rate varies from 1.5 to 3.0 fl. oz. per 1000 sq.ft.

    Packaging : Qt and 2.5 gallon jug

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  3. Quali Pro T/I 2.5 G

    T/I 2.5G Herbicide Granules with Trifluralin 2% and Isoxaben 0.5% is the same formulation as Snapshot 2.5 Herbicide Granules.

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  4. Prodiamine 4L-2.5 Gallon

    Prodiamine 4L is a flowable liquid pre-emergent herbicide. Compare to Syngenta's Barricade with 40.8% Prodiamine, but more economical.

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  5. XL 2G Granules - 50 lb. bag

    This pre-emergent, selective herbicide is a specialty herbicide that contains both Surflan and Balan for a double knockdown of difficult to control crabgrass and more than 50 types of annual grasses and broadleaf weeds. As a pre-emergent herbicide, use XL 2G prior to germination of target weeds or right after cultivation. It does not control existing weeds. For existing weeds, use a post-emergent herbicide with 41 %  Glyphosate such as, Eraser , Agrisel GlyPhoSel Pro 41% or cultivation.

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  6. Snapshot DG Herbicide 25 lb

    Snapshot DG (Dispersible Granules) Herbicide is a pre-emergent herbicide that quickly disperses into grounds, landscape beds, or nursery containers when watered to control 125 broadleaf and grassy weeds. It can be used over the top of more than 600 labeled ornamentals.

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  7. Snapshot 2.5 TG

    Snapshot 2.5 TG provides season long control (up to 6- 8 months) of broadleaf and grassy weeds as a selective pre-emergence herbicide. Snapshot 2.5 TG disperses easily into the target area, acting like a liquid herbicide but in granule form.

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  8. Alligare Prodiamine 65 WG

    Starting at: $61.25

    Alligare'a Prodiamine 65 WG (wettable granule) contains 65.0% prodiamine. It is a pre-emergent that controls crabgrass and other broadleaf and grassy weeds in established turfgrass (excludes golf course putting greens), lawns and sod nurseries, field grown, and landscape ornamentals, and more. The flexible label allows for both spring and fall applications for season-long control. Learn More
  9. Dimension 2EW Herbicide

    Starting at: $167.50

    Dimension 2EW Herbicide with Dithiopyr 24% is speciality pre-emergent and early post-emergent herbicide for weeds such as crabgrass. Because it works as a pre-emergent and early post-emergent Dimension 2EW is the perfect choice for those parts of the country where the weather can be unpredictable. As a water based herbicide, Dimension 2EW Herbicide can be used over the top of field and container-grown nursery and landscape ornamentals, and in established lawns, golf course fairways, roughs and tee boxes, and commercial sod farms.

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  10. Agrisel Surflan Pro-pt

    Starting at: $29.95

    Out of stock

    Agrisel Surflan Pro-Oryzalin 40.4%

    Surflan Pro, with Oryzalin is a preeemergent herbicide used as a surface application on a wide spectrum of more than 100 different grasses and weeds found in ground covers, perennials, established warm-season turfgrass, ornamental plantings, non-bearing trees, non-cropland, industrial sites and Christmas tree plantations.

    Surflan Pro and be used alone or a tank mix combination with glyphosate to provide post emergence control of labeled weeds.(Do not spray tank mix with glyphosate over the top of ornamental plants, trees, foliage and other desirable vegetation.

    Surflan Pro will remain stable on the soil surface up to 21 days after application. If there is no rainfall, use irrigation to activate Surflan Pro.

    Since Oryzalin is an orange color, Surflan Plus may cause temporary discoloration of sprayed areas. Don't spray concrete or wood. Wear gloves when mixing and applying.

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