I have completed numerous overseed applications in northeast Oklahoma with great success. Based on my experience of the first 10 years in overseed services, I have developed a checklist for proper lawn overseeding preparation. I have found that the projects that followed this checklist achieved the best results and went the smoothest.
Check your recent chemical application list
Goal: Ensure germination is possible
General: For those on a weed control program, review your application record for a pre-emergent herbicide or a post emergent herbicide with pre emergent qualities applied in the previous 6 months. Pre-emergent herbicides stop seeds from fully developing and impair your project's seed germination rate.
Common Pre-Emergent Herbicides:
Atrizine
Barricade (Prodiamine)
Dimension (Dithiopyr)
Princep (Simazine)
Common Post-Emergent Herbicides with pre-emergent action:
MSM*
Tenacity (Mesotrione)*
*Incomplete list. Seed window varies by use rate.
Pro Tip: Consult with your weed control provider for advice regarding herbicides applied. DIY applicators should review each product label applied in the previous 6 months.
Protect property
Goal: Protect underground obstacles
General: With the exception of Bermudagrass, all establishment seed application will require penetrating the soil. To protect underground property, homeowners are asked to mark irrigation heads, valve boxes, invisible dog fences, and any other obstacles that could be damaged by 6" steel implements puncturing the soil.
Pro Tip: Submit a utility locate ticket for your property.
Physically prepare your lawn for overseeding
Goal: Maximize Seed to Soil Contact
Mowing: In the weeks leading up to your seed application it is advised that you lower your lawn's canopy height. The week of your seed application should be completed on the lowest mower setting that does not gouge the soil.
Lawn Debris: Grass clippings, leaves, and other debris can prevent your seed from reaching the soil. Seed that does not contact the soil cannot germinate until that contact is made.
Watering now speeds up germination later
Goal: Provide stored water to your soil
Irrigation: Ensure your soil is moist to a depth of at least 2" the day of seed application without standing water at the surface.
Pro Tip: Irrigate your lawn daily for 10-15 minutes per zone starting 7 days before your seed application. Maintain this schedule for the next 6 days. Do not water the day of service.
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