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:
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
*temperatures vary year to year so optimal application could vary from these dates
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.
$64.50 As low as: $61.90
Prodiamine 65 WDG is a wettable dispersible granule ( WDG ) . As a pre-emergent herbicide, the versatility of Prodiamine 65 WDG allows applications both in spring and fall seasons for year long control .This Quali-Pro herbicide is particularly effective against many of the hard-to-kill grassy weeds such as crabgrass and annual bluegrass.Learn More
Starting at: $64.95
Pendulum 2 G, with pendimethalin is a granulated herbicide that is an economical choice for a pre-emergent coverage in turf areas and around ornamentals. Pendulum 2G is applied at the rate of 1.7 to 4.6 lbs. per 1,000 square ft. or 75-100 lbs per acre. Pendulum 2G controls over 40 different broadleaf and grassy weeds. With over 335 listed ornamentals, Pendulum 2G is safe around and over the top of listed annual, perennial and woody ornamentals, with university specialists recommending its crop safety.Learn More
Starting at: $46.50
Concern Weed Prevention Plus for Lawn Care 8-2-4 with 100% natural corn gluten is a pre-emergent herbicide plus a fertilizer of bone meal and sulfate to gently fertilize your lawn for green and lush grass. As a pre-emergent, it controls up to 90% of weed control in the first year on dandelions and crabgrass and other listed weeds. It combines corn gluten meal (82%), nitrogen (8%), phosphate (2%) and potash (4%) for a all-in-one product. However, if you have existing weeds, it will not stop their growth.
To make sure that the corn gluten absorbs into the ground, water in after application. After that, it is best to have a few dry days (rain-free) for a couple of days. Wait for 6 weeks for an application if you have newly seeded lawns.Learn More
Birchmeier Granomax 5 over the shoulder spreader spreads fertilizers, granules, grass seed, rock salt, etc. It quickly and evenly spreads these granulated items with its spread head's unique design. It is effective in both broadcast or spot applications and has a five-stage rate control.Learn More
$72.99 As low as: $70.40
Compare Dithiopyr 40WSB Herbicide to Dimension Ultra 40 WP, ( both contain Dithiopyr 40.0%). Dithiopyr 40 WSB is more economical.
Dithiopyr 40 WSB is an excellent herbicide for pre-emergent control of crabgrass. Other important grasses include kikuyugrass, goosegrass, chickweed, annual bluegrass, barnyard grass, oxalis, ryegrass, spurge. See the product label for all the listed annual grasses and broadleaf weeds. It may be used on established turf, field-grown nurseries, golf courses, landscape ornamentals and more listed locations.Learn More
Starting at: $24.00
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.Learn More
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.Learn More
Starting at: $60.95Alligare'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