How to Seed After Using Roundup

Roundup is a nonselective herbicide that contains the active ingredient glyphosate. Nonselective herbicides kill almost every form of vegetation they touch, including seeds. Therefore, if Roundup is lingering in the soil, it can affect the germination rate of your lawn seed. Fortunately, by applying Roundup a week or two before you plan to seed, and then properly preparing your lawn for the seed, you should have a good start to a successful lawn.

Power or garden rake
Garden hose
Fertilizer

Instructions

- 1
  Wait until the weeds turn brown and die after being sprayed with Roundup. This normally takes five to 14 days.
- 2
  Water the lawn area with 1 inch of water to soak it about 6 to 8 inches deep.
- 3
  Remove the thatch and debris with a power rake, with the tines set to rake 1/8 to 1/2 inch deep. Or, use a garden rake for small, manageable areas. Rake and remove the debris.
- 4
  Apply a complete lawn fertilizer to the area, available at garden centers. For every 1,000 square feet, 1/2 lb. of nitrogen should be applied, which will vary among fertilizers, since they have different rates of nitrogen. Your lawn is ready to seed.

Types of Tall Grasses

The Correct Amount of Time to Water a Lawn When Seeding

Growing Grass