How To: Overseed
Establish seeding date.
About eight weeks before first frost is best.
Identify and correct the problem.
If you skip this step you are bound to encounter the same problems down the line.
Control weeds/apply plant growth regulator.
If using broadleaf controls, apply at least four weeks before seeding — one exception is with carfentrazone (Quicksilver by FMC and an ingredient in Speedzone by PBI/Gordon) where you can apply two weeks or more before seeding.
Plant growth regulators can be used to slow down the growth of the existing stand into which you are overseeding. An application will allow the seedling stand to take hold before the existing stand comes out of suppression.
- Mow to 1-1.5 inch and collect clippings.
- Core aerate and vertical mow to break up cores and dethatch.
- Remove thatch.
You can apply the seed and lightly work the seed in with a drag mat as one approach. Or, for better results, use a slit seeder.
Seeding rate should be about the same as you would use for establishment on bare ground.
Nitrogen starter and phosphorus for root growth are a must. Irrigate.
Frequent light irrigation will kick up your water bill but it also is a must.
Refrain from applying post-emergence broadleaf herbicides or preemergence annual grass herbicides until after two mowings.
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